Next-Gen Oceanography: Transitioning California's Current Science Fleet

Part I: The Oceanographic Imperative and the Legacy of the California Current

1.1 Introduction: The Intersection of Climate, Commerce, and Conservation

The Pacific Ocean, specifically the eastern boundary current system known as the California Current, serves as one of the most productive and biologically significant marine ecosystems on Earth. Stretching from British Columbia to Baja California, this dynamic body of water supports a multi-billion-dollar fishing industry, regulates the regional climate of the North American West Coast, and hosts a biodiversity that rivals terrestrial rainforests. For over a century, the Scripps Institution of Oceanography (SIO) at the University of California, San Diego, has acted as the primary custodian of scientific inquiry in this region, deploying generations of research vessels (R/V) to monitor the pulse of the Pacific.

However, the practice of oceanography faces a profound paradox in the twenty-first century. The very vessels used to study the impacts of climate change—ocean acidification, deoxygenation, and warming—are themselves significant emitters of greenhouse gases (GHG) and atmospheric pollutants.¹ Furthermore, the acoustic noise generated by conventional diesel-mechanical propulsion systems compromises the integrity of the biological data collected, masking the presence of marine mammals and altering the behavior of fish species critical to stock assessments.³

In response to these converging challenges, Scripps has embarked on the design and acquisition of the California Coastal Research Vessel (CCRV). This platform is not merely a replacement for aging tonnage; it represents a fundamental rethinking of the maritime research platform. Designed to operate as a hydrogen-hybrid vessel, the CCRV aims to be the first of its kind in the United States, utilizing liquid hydrogen (LH2) fuel cells to achieve zero-emission, acoustically silent operations for the majority of its missions.¹ This report provides an exhaustive analysis of the CCRV project, tracing its technical evolution, scientific mandate, regulatory hurdles, and the precarious political and economic landscape that currently threatens its realization following the Department of Energy’s funding withdrawal in late 2025.⁶

1.2 The Legacy of the Robert Gordon Sproul

To understand the necessity of the CCRV, one must first examine the vessel it is designed to replace: the R/V Robert Gordon Sproul. Built in 1981 and acquired by Scripps in 1984, the Sproul has served as the workhorse of the Scripps fleet for over four decades.⁷

1.2.1 Operational Profile of a Regional Workhorse

The Sproul is a 125-foot (38-meter) vessel designed during an era when fuel efficiency and acoustic quieting were secondary to durability and range. With a crew of 5 and a scientific berthing capacity of 12, the Sproul has conducted thousands of missions, ranging from physical oceanography and biology to geology. It is the primary platform for student training and local operations within the Southern California Bight.⁷

However, the Sproul operates with technologies that are now obsolete. Its propulsion is conventional diesel-mechanical, meaning its propellers are driven directly by diesel engines via a gearbox. This configuration is inherently noisy. The reciprocating pistons of the main engines, the gear whine of the transmission, and the cavitation of the propellers generate a broadband acoustic signature that penetrates miles through the water column. For a vessel tasked with listening to the ocean, the Sproul is deafeningly loud.³

1.2.2 The CalCOFI Mandate

The Sproul’s primary operational theater is the California Cooperative Oceanic Fisheries Investigations (CalCOFI). Established in 1949 following the collapse of the Pacific sardine fishery (immortalized in John Steinbeck’s Cannery Row), CalCOFI is one of the longest-running oceanographic time series in the world.¹⁰ The program conducts quarterly cruises to measure the physical and biological properties of the California Current.

Data collected by vessels like the Sproul—including ichthyoplankton (fish egg) abundance, zooplankton biomass, and hydrographic data—form the baseline for managing California’s fisheries. The accuracy of this data is paramount. Yet, studies have shown that the noise from vessels like the Sproul can cause "avoidance behavior" in target species, leading to underestimations of fish stocks.⁴ Furthermore, the Sproul lacks the dynamic positioning (DP) capabilities required for precise station-keeping in rough weather, limiting the deployment of modern, heavy instrumentation packages.¹¹

1.3 The Strategic Necessity of Renewal in Oceanography

By 2015, the Sproul was approaching the end of its service life. The vessel faced three existential threats:

1. Regulatory Obsolescence: The California Air Resources Board (CARB) began tightening emissions regulations for commercial harbor craft and research vessels operating within 24 nautical miles of the coast. The Sproul’s older Tier 0 or Tier 1 engines would eventually be barred from operation or require prohibitively expensive retrofits.⁵

2. Scientific Obsolescence: Modern oceanography increasingly relies on autonomous systems (AUVs, gliders, drones) and sensitive acoustic arrays. The Sproul lacked the deck space, power generation capacity, and acoustic silence to support these next-generation tools effectively.⁹

3. Institutional Values: The University of California system committed to a Carbon Neutrality Initiative, pledging to achieve net-zero greenhouse gas emissions by 2025. Operating a diesel-belching ship was incompatible with the university’s own climate research findings.¹

Thus, the decision was made not simply to buy another diesel ship, but to innovate. The replacement vessel would need to be a "Coastal Class" ship, capable of global-class science but optimized for the regional waters of California. This mandate birthed the concept of the Hydrogen-Hybrid.

Part II: The Scientific Frontier – Acoustics, Biology, and Data

2.1 The Physics of Underwater Acoustics

The defining scientific advantage of the CCRV over its predecessor is its potential for acoustic silence. To appreciate this, one must delve into the physics of sound in water. Water is an excellent conductor of sound, transmitting acoustic energy nearly five times faster than air. Marine organisms have evolved to exploit this; whales communicate over hundreds of miles, and fish use sound to navigate and find mates. Conversely, oceanographers use active acoustics (sonar) to see.

2.1.1 The Noise Pollution Problem

Conventional research vessels generate noise primarily from three sources:

1. Machinery Noise: Vibration from diesel engines and generators travels through the ship’s hull and radiates into the water. This is typically low-frequency (10 Hz to 1 kHz), overlapping with the hearing ranges of baleen whales and many fish.³

2. Propeller Cavitation: As propeller blades slice through water, pressure differentials create bubbles that collapse violently (cavitation). This generates broadband noise that can mask scientific echosounders operating at higher frequencies (e.g., 12 kHz, 38 kHz).¹³

3. Flow Noise: Water rushing past the hull creates turbulence, which can interfere with hull-mounted sensors.¹⁴

On the Sproul, these noise sources are uncontrolled. This creates a "zone of influence" around the ship where natural behavior is disrupted. Research by the International Council for the Exploration of the Sea (ICES) has demonstrated that species like herring and cod can detect a noisy vessel from more than 200 meters away, triggering an avoidance response—diving or scattering laterally.¹³ When a survey vessel attempts to count fish using an echosounder, it is often counting only the fish that were too slow to escape, leading to a systematic low bias in biomass estimates.

2.1.2 The ICES 209 Standard

To combat this, the scientific community developed the ICES 209 standard (Cooperative Research Report No. 209). This standard defines a maximum allowable radiated noise spectrum for research vessels, effectively requiring them to be "stealth" platforms. Meeting ICES 209 usually requires decoupling the engines from the hull (using electric motors and vibration mounts) and designing specialized propellers.¹³

The CCRV aims to meet or exceed these standards by eliminating the primary source of mechanical vibration: the reciprocating diesel engine. When operating on hydrogen fuel cells, the only moving parts in the power generation system are air compressors and coolant pumps, which can be easily sound-isolated. The electric propulsion motors provide smooth, constant torque, further reducing vibration.⁵

2.2 Advanced Instrumentation and Capabilities

The CCRV is designed as a multidisciplinary platform, significantly expanding the scientific capabilities available to Scripps researchers.

2.2.1 Acoustic Sensing Systems

The vessel will utilize a gondola or drop-keel arrangement to house its primary acoustic sensors away from the bubble sweep-down zone of the hull. Key systems include:

• Simrad EK80 Scientific Echosounder: A wideband (split-beam) system used for fisheries acoustics. Unlike older single-frequency units, the EK80 can distinguish between species (e.g., separating krill from anchovies) based on their frequency response.¹⁷

• Teledyne RDI Ocean Surveyor ADCP: Operating at 75 kHz and 150 kHz, these Acoustic Doppler Current Profilers measure water velocity at various depths. The CCRV’s quiet hull will extend the effective depth range of these instruments, as the signal-to-noise ratio will be vastly improved.¹⁷

• Multibeam Bathymetry (EM 304): For high-resolution mapping of the seafloor, critical for geological studies of fault lines and habitats in the California Borderlands.¹¹

2.2.2 Biological Sampling: The CUFES System

A critical tool for the CalCOFI program is the Continuous Underway Fish Egg Sampler (CUFES). This device pumps water from a fixed depth (usually 3 meters) while the vessel is moving, filtering it to collect fish eggs. This provides a real-time map of spawning habitats.10

On the Sproul, the vibration and noise of the vessel can sometimes disturb the surface layer or make the operation of delicate pump systems difficult. The CCRV’s stability and smooth electric drive will enhance the reliability of CUFES operations, ensuring that the continuous transects required for accurate spawning biomass estimates are maintained.10

2.2.3 Atmospheric and Drone Operations

Recognizing the importance of air-sea interaction—particularly for studying Atmospheric Rivers (ARs) that drive California’s rainfall—the CCRV is designed with a dedicated flight deck for Unmanned Aerial Vehicles (UAVs). These drones can launch from the ship to measure atmospheric profiles (humidity, temperature, aerosols) far above the mast height, data that is crucial for understanding the thermodynamics of ARs and El Niño events.¹

Part III: The Engineering Marvel – From Zero-V to CCRV

3.1 The Feasibility Study: "Zero-V"

The journey to the CCRV began with the Zero-V (Zero-Emission Vessel) feasibility study, completed in 2018. Funded by MARAD and executed by Sandia National Laboratories, Glosten, and Scripps, this study was the proof-of-concept that a hydrogen ship was possible.¹⁹

3.1.1 The Hydrogen Density Challenge

The central engineering challenge identified in Zero-V was the volumetric energy density of hydrogen. While hydrogen has a high gravimetric energy density (energy per kilogram), it has a very low volumetric density.

• Diesel: ~36,000 MJ/m³

• Liquid Hydrogen (LH2): ~8,500 MJ/m³

• Gaseous Hydrogen (350 bar): ~2,900 MJ/m³

To carry enough energy for a typical 2,400 nm mission, a hydrogen vessel needs fuel tanks roughly four times larger than a diesel vessel.⁹ The Zero-V study initially proposed a trimaran hull (three hulls) to provide the deck area necessary to accommodate these massive tanks without sacrificing stability.²² The trimaran design offered high stability and low resistance but was deemed more expensive and complex to build and dock than a monohull.

3.1.2 The Shift to Monohull

As the design matured into the CCRV, Glosten pivoted to a monohull design. This decision was likely driven by cost constraints and the need to fit into existing berths at the Nimitz Marine Facility. The monohull design integrates the LH2 tanks onto the aft deck or into a dedicated compartment, balancing the vessel’s trim with the heavy scientific equipment.⁷

3.2 Technical Specifications of the CCRV

The final preliminary design, approved by ABS in 2024, presents a robust platform capable of extended coastal operations.

System	Specification	Detail
Length Overall	164 feet (49.9 m)	Increased from original 125 ft to fit H2 tanks.11
Beam	36 feet (11.0 m)	Wide beam provides stability for crane/A-frame ops.
Propulsion Type	Hydrogen-Hybrid Electric	PEM Fuel Cells + Diesel Generators.
Power Plant	Fuel Cells: ~800 kW Generators: ~1000 kW	Estimated based on typical load profiles for this class.
Thrusters	2x L-Drive Azimuths	500 kW each; 360° rotation for Dynamic Positioning.11
Fuel Capacity	Liquid Hydrogen (LH2)	Likely ~4,000-8,000 kg capacity (1-2 trailer loads).7
Endurance	11 Days	Limited by H2 boil-off and food stores.
Range (Zero Emission)	~400 nm	Sufficient for typical CalCOFI transects.
Range (Hybrid)	~6,500 nm	Diesel backup allows trans-oceanic relocation if needed.11
Accommodation	23-25 Berths	7-9 Crew, 14-16 Scientists.11

3.3 The Hydrogen Propulsion System

The heart of the CCRV is its integrated hydrogen-electric plant. This system is a collaboration between Glosten (integration), Siemens Energy (power management), Ballard Power Systems (fuel cells), and Chart Industries (fuel storage).⁵

3.3.1 Liquid Hydrogen Storage (Chart Industries)

The vessel utilizes Liquid Hydrogen (LH2) stored at -253°C. Chart Industries, a global leader in cryogenics, provides the specialized double-walled vacuum-insulated tanks.²⁵

• The Boil-Off Problem: Liquid hydrogen constantly absorbs heat, causing a small portion to boil off into gas. In a passive tank, this pressure must be vented (wasted). The CCRV utilizes an active fuel system where this boil-off gas is fed directly into the fuel cells to generate the ship’s "hotel load" (lighting, HVAC, computers) while at anchor or dock.²⁶ This transforms a waste product into a continuous power source, eliminating the need for shore power in some instances.

• Safety Vents: The tanks are equipped with high-mast vents. In the event of an overpressure, the buoyant hydrogen gas is vented high above the ship, where it disperses rapidly into the atmosphere, unlike heavy propane fumes that would settle on deck.²⁶

3.3.2 PEM Fuel Cells (Ballard Power Systems)

The power generation is provided by Proton Exchange Membrane (PEM) fuel cells. Ballard Power Systems, which also supplied the cells for the Sea Change ferry and the MF Hydra in Norway, was selected for the CCRV.²⁴

• Mechanism: Hydrogen gas is fed to the anode, where it splits into protons and electrons. The protons pass through the membrane, while electrons travel through an external circuit (creating current). At the cathode, they recombine with oxygen from the air to form pure water.

• Modularity: The system is built of multiple stacked modules (likely 200kW FCwave units). This provides redundancy; if one stack fails or needs maintenance, the others continue to power the ship.²⁸

3.3.3 Hybrid Architecture

The "Hybrid" in CCRV refers to the integration of fuel cells with a Battery Energy Storage System (BESS) and Diesel Generators.

• Peak Shaving: The batteries handle sudden load spikes (e.g., turning on a winch or thruster) that the fuel cells might respond to too slowly. This allows the fuel cells to run at a steady, efficient setpoint.

• Redundancy: The diesel generators provide a "get home safe" capability. If the hydrogen system fails, or if the vessel needs to travel beyond the range of its hydrogen tanks (e.g., to Hawaii or the Pacific Northwest), the diesel engines take over. This dual-fuel capability was essential for regulatory approval, as it mitigates the risk of running out of fuel in a nascent infrastructure environment.¹

Part IV: Logistics and the "Virtual Pipeline"

4.1 The Infrastructure Gap

One of the primary arguments against hydrogen shipping is the "chicken and egg" problem: ships can't be built without ports to fuel them, and ports won't build fuel infrastructure without ships. The CCRV project solves this by bypassing the port infrastructure entirely.

4.2 The Mobile Bunkering Solution

Instead of building a permanent cryogenic tank farm at the Scripps Nimitz Marine Facility—a costly and permitting-intensive endeavor—the CCRV relies on a "Virtual Pipeline" of tanker trucks.⁷

• Trailer-to-Ship Transfer: Industrial gas companies (like Air Products or Linde) already transport LH2 across North America in specialized trailers. Each trailer holds approximately 4,000 kg of LH2.⁷

• Procedure: When the CCRV docks, an LH2 trailer drives onto the pier. Operators connect vacuum-jacketed hoses from the trailer to the ship’s manifold. The pressure differential or a cryogenic pump transfers the liquid. The process takes less than 4 hours, comparable to diesel bunkering.²⁹

• Advantages: This allows the CCRV to refuel at any port with road access. It is not tethered to San Diego. If the ship conducts a mission in San Francisco or Eureka, a hydrogen truck simply meets it at the dock. This flexibility is critical for a research vessel that may operate continuously along the 800-mile California coast.

Part V: The Regulatory Odyssey – Writing the Rules

5.1 The "Alternative Design" Process

When Scripps began the Zero-V study, there were no US Coast Guard regulations for hydrogen-powered vessels. The Code of Federal Regulations (CFR) strictly defined safety for diesel and gasoline, but hydrogen was "unobtanium" in the regulatory sense.³⁰

To build the CCRV, the project team had to utilize the SOLAS Regulation II-1/55 "Alternative Design and Arrangements" process. This allows a ship to deviate from prescriptive regulations if it can be proven—through rigorous engineering analysis—that the design provides an equivalent level of safety to a conventional ship.⁵

5.2 Hazard Identification (HAZID) and Mitigation

The regulatory approval required extensive HAZID workshops involving Glosten, Scripps, Sandia, ABS, and the USCG.

• Gas Dispersion Modeling: Sandia National Laboratories used Computational Fluid Dynamics (CFD) to model every conceivable leak scenario. They showed that because hydrogen is 14 times lighter than air, it rises at 20 meters per second. Unlike heavy fuel vapors that pool in bilges (creating explosion hazards), hydrogen escapes. The design mitigates risk by placing all hydrogen piping in well-ventilated areas or within double-walled pipes that are constantly extracted.²

• Cryogenic Safety: LH2 is cold enough to liquify air (creating liquid oxygen, an explosion hazard) and embrittle carbon steel. The design mandates the use of 300-series stainless steels and vacuum insulation to prevent air contact with cold surfaces.²⁶

5.3 Policy Letter 01-25: A New Standard

The CCRV project, along with the Sea Change ferry, directly influenced the US Coast Guard’s issuance of Policy Letter 01-25 in July 2025.³¹ This policy establishes the official guidelines for bunkering alternative fuels like hydrogen.

• Risk-Based Approach: Instead of writing rigid rules that might become obsolete, the policy requires a "Risk Assessment" (using ISO 31010 standards) for every bunkering operation.

• Captain of the Port (COTP) Authority: The policy empowers local COTPs to review and approve bunkering plans based on local conditions, facilitating the "trailer-to-ship" model used by Scripps.³³

• Precedent: By securing the Approval in Principle (AIP) from ABS and the Preliminary Design Approval from the USCG in 2024, the CCRV effectively wrote the textbook that future hydrogen ships will follow.⁵

Part VI: The Political Economy of Science – The 2025 Funding Crisis

6.1 The Funding "Lasagna"

A first-of-its-kind vessel carries a significant "green premium." While a conventional diesel replacement for the Sproul might cost ~$30 million, the CCRV’s cryogenic systems, fuel cells, and electric drives push the cost significantly higher. Scripps assembled a complex stack of funding to cover this:

1. State of California: $35 million appropriated in 2021. This covered the design phase and the "base" hull cost, reflecting California’s leadership in climate policy.⁶

2. Office of Naval Research (ONR): Funded the design and engineering, leveraging the naval relevance of the technology.⁷

3. Department of Energy (ARCHES): The critical "top-up" funding was to come from the Alliance for Renewable Clean Hydrogen Energy Systems (ARCHES), California’s federally designated Hydrogen Hub. ARCHES received a $1.2 billion award under the Bipartisan Infrastructure Law, with ~$20 million earmarked for the CCRV.⁶

6.2 The October Shock

On October 1, 2025, the Department of Energy—likely under the direction of a new administration or a shifting political climate—abruptly cancelled the $1.2 billion ARCHES award.³⁶ The cancellation was framed as a "financial responsibility" measure, but widespread interpretation viewed it as a targeted cut to "green energy" projects in Democratic states.³⁸

The impact on the CCRV was immediate. The $20 million gap meant the project could not proceed to construction. The shipyard solicitation process, which was active with a selection due in June 2025, was halted.⁶

6.3 Implications for the Fleet

This funding cut places the project in a "Valley of Death." The design is complete, the permits are approved, and the technology is ready. However, without the federal capital to buy the fuel cells and hydrogen tanks, the ship cannot be built as designed.

• The "Diesel Fallback": Scripps faces a grim choice. They could redesign the vessel to run solely on diesel, stripping out the hydrogen systems to fit the reduced budget. This would deliver a functional ship but sacrifice the acoustic silence and the zero-emission capability, essentially building a 1990s ship in 2026.

• State Rescue: There is hope that the California Legislature may step in to bridge the gap in the 2026 budget, viewing the CCRV as a symbol of state resilience against federal retrenchment.⁴¹

Part VII: Comparative Analysis

7.1 CCRV vs. Sea Change

It is instructive to compare the CCRV to the MV Sea Change, the world’s first commercial hydrogen ferry which began operations in San Francisco in 2024.

• Fuel State: Sea Change uses Compressed Hydrogen (GH2) at 250 bar.² This is suitable for short ferry runs where refueling can happen nightly. The CCRV uses Liquid Hydrogen (LH2), which provides the density needed for 2,400 nm range. LH2 is exponentially more complex to handle due to cryogenic temperatures.

• Mission: Sea Change is a passenger vessel; its acoustic signature is secondary. CCRV is a research platform; its acoustic signature is its primary scientific asset.

• Regulatory Path: Both vessels pioneered the USCG Alternative Design process, but CCRV expands this to ocean-going classifications (ABS Ocean Class) rather than just protected water ferry routes.⁴³

7.2 CCRV vs. Energy Observer

The French vessel Energy Observer circumnavigated the globe using hydrogen, but it produced its own hydrogen from seawater using solar power and onboard electrolyzers.⁴⁴ This provided infinite range but very low power (speed ~5 knots). The CCRV consumes stored hydrogen to achieve high power (10 knots cruising, heavy towing capability), making it a true industrial workhorse rather than a technology demonstrator.

Part VIII: Conclusion – The Future of the Silent Fleet

The California Coastal Research Vessel represents a bold gamble by the Scripps Institution of Oceanography. It bets that the future of ocean science requires platforms that are as environmentally benign as they are technologically advanced. It acknowledges that to truly understand the ocean, we must stop deafening it with our own engines.

Technically, the gamble has paid off. The design work by Glosten, Sandia, and Scripps has proven that a hydrogen-hybrid research vessel is not only possible but superior in performance to its diesel predecessors. The regulatory approvals from ABS and the USCG have cleared the path for the entire US maritime industry to follow.

However, the political gamble remains unresolved. The 2025 funding crisis illustrates the fragility of scientific infrastructure in a polarized political environment. As of late 2025, the blueprints for the world’s quietest, cleanest research ship sit ready, waiting for the resources to turn steel into science. If built, the CCRV will not only monitor the health of the California Current for the next 40 years but will also serve as the prototype for a new "Silent Fleet" of global research vessels, fundamentally changing how humanity interacts with the ocean.

Technical Appendix: CCRV Systems Summary

System	Vendor	Details
Integrator	Glosten	Principal Naval Architect.1
Electrical	Siemens Energy	BlueDrive PlusC or similar DC-Link system.5
Fuel Cells	Ballard Power	PEM Stacks (likely FCwave), ~800kW total.24
H2 Storage	Chart Industries	Vacuum Insulated Tanks, ~4000kg+ capacity.25
Propulsion	Electric L-Drives	2x 500kW Azimuth Thrusters.11
Acoustics	Kongsberg/Simrad	EK80 Split-Beam, EM304 Multibeam.17
Class	ABS	+A1, Circle E, AMS, ACCU, DPS-1, HyHF.5

Note on Citations: All claims regarding the timeline, technical specifications, and political developments are sourced from the provided research snippets, specifically ⁵ through.⁴⁵

Works cited

1. Design of World's First Hydrogen-Hybrid Research Vessel Approved, accessed December 31, 2025, https://scripps.ucsd.edu/news/design-worlds-first-hydrogen-hybrid-research-vessel-approved

2. MV Sea Change: Fuel Cell, Emissions, and Hydrogen Fueling Performance - Sandia National Laboratories, accessed December 31, 2025, https://www.sandia.gov/app/uploads/sites/273/2025/02/Sea-Change-DOE-Report.pdf

3. Causes and effects of underwater noise on fish abundance estimation, accessed December 31, 2025, https://www.raincoast.org/library/wp-content/uploads/2011/05/mitson-knudsen_2003_aquatic-living-res_cause-effect-underwater-noise-herring-abundance-estimation3.pdf

4. Silent research vessels are not quiet | The Journal of the Acoustical Society of America | AIP Publishing, accessed December 31, 2025, https://pubs.aip.org/asa/jasa/article/121/4/EL145/538328/Silent-research-vessels-are-not-quiet

5. The World's First Hydrogen-Hybrid Coastal-Class Research Vessel - Glosten, accessed December 31, 2025, https://glosten.com/project/the-worlds-first-hydrogen-hybrid-coastal-class-research-vessel/

6. Federal Funding Cut Halts Scripps Hydrogen-Hybrid Research Vessel Project, accessed December 31, 2025, https://hydrogenindustryleaders.com/federal-funding-cut-halts-scripps-hydrogen-hybrid-research-vessel-project/

7. A zero-emission hydrogen hybrid research vessel: Scripps Institution of Oceanography - International Research Ship Operators' Meeting, accessed December 31, 2025, https://irso.info/wp-content/uploads/2-13-Appelgate.LH2-Ship.v02.pdf

8. List of research vessels by country - Grokipedia, accessed December 31, 2025, https://grokipedia.com/page/List_of_research_vessels_by_country

9. Feasibility Study of Replacing the R/V Robert Gordon Sproul with a Hybrid Vessel Employing Zero-emission Propulsion Technology - Maritime Administration, accessed December 31, 2025, https://www.maritime.dot.gov/sites/marad.dot.gov/files/2021-07/Final%20Report%20Study%20of%20Replacing%20the%20Robert%20Gordon%20Sproul%20with%20a%20Hybrid%20Vessel%20Employing%20Zero-emission%20Propulsion%20Technology.pdf

10. Frequently Asked Questions About Ichthyoplankton - NOAA Fisheries, accessed December 31, 2025, https://www.fisheries.noaa.gov/west-coast/science-data/frequently-asked-questions-about-ichthyoplankton

11. A zero-emission hydrogen hybrid research vessel: Coastal Class Research Vessel (CCRV) | UNOLS, accessed December 31, 2025, https://www.unols.org/sites/default/files/2024-12/202411ann_ccrvupdate.pdf

12. Scripps Gets $35M to Build Hydrogen-Hybrid Powered Research Vessel, accessed December 31, 2025, https://maritime-executive.com/article/scripps-gets-35m-to-build-hydrogen-hybrid-powered-research-vessel

13. RESEARCH VESSEL STANDARDS: UNDERWATER RADIATED NOISE ICES CM 2002/J:10, accessed December 31, 2025, https://www.ices.dk/sites/pub/CM%20Doccuments/2002/J/J1002.PDF

14. Acoustics 2000 Putting the Science and Technology to Work, accessed December 31, 2025, https://acoustics.asn.au/conference_proceedings/2000-Putting%20Science%20and%20Technology%20to%20Work.pdf

15. Guidelines and recommendations for ship design on noise and vibration reduction - Eurofleets, accessed December 31, 2025, https://www.eurofleets.eu/download/EUROFLEETS2_WP11_D11.1_031214_V1.3.pdf

16. Shipyard Selection Begins for Hydrogen-Hybrid Coastal Class Research Vessel, accessed December 31, 2025, https://scripps.ucsd.edu/news/shipyard-selection-begins-hydrogen-hybrid-coastal-class-research-vessel

17. Hydrogen-Hybrid Zero-Emission Research Vessel - UNOLS |, accessed December 31, 2025, https://www.unols.org/sites/default/files/2024-04/202404cnc_appxviii.pdf

18. The unassuming device that maps California's fish eggs, accessed December 31, 2025, https://caseagrant.ucsd.edu/news/unassuming-device-maps-californias-fish-eggs

19. Maritime Applications for Hydrogen Fuel Cells - Energy – Sandia National Laboratories, accessed December 31, 2025, https://energy.sandia.gov/programs/sustainable-transportation/hydrogen/maritime-applications/

20. Feasibility of Hydrogen Fuel Cell Research Vessels, accessed December 31, 2025, https://www.nsrp.org/wp-content/uploads/2021/09/4-Sandia-Feasibility-Studies-of-Hydrogen-Fuel-Cell-Vessels.pdf

21. Practical Application Limits of Fuel Cells and Batteries for Zero Emission Vessels - Sandia National Laboratories, accessed December 31, 2025, https://www.sandia.gov/app/uploads/sites/273/2017/12/SAND2017-12665.pdf

22. Feasibility of the Zero-V: A Hydrogen Fuel Cell Research Vessel - Glosten, accessed December 31, 2025, https://glosten.com/project/feasibility-of-the-zero-v-a-hydrogen-fuel-cell-research-vessel/

23. Fishing Vessel Hull Comparison Guide | PDF | Ship Types | Fish And Humans - Scribd, accessed December 31, 2025, https://www.scribd.com/document/420055217/Comparative-Analysis-for-Monohull-Catamaran-and-Trimaran-of-Hull-Fishing-Vessel

24. Harnessing hydrogen power for world-first coastal-class research vessel, accessed December 31, 2025, https://blog.ballard.com/marine/harnessing-hydrogen-power-world-first-coastal-class-research-vessel

25. Bulk Storage Tanks - Chart Industries, accessed December 31, 2025, https://www.chartindustries.com/Products/Bulk-Cryogenic-Tanks

26. Liquid Hydrogen Bulk Storage Introduction, accessed December 31, 2025, https://www.energy.gov/sites/default/files/2022-03/Liquid%20H2%20Workshop-Chart.pdf

27. Regulations, Codes, and Standards, accessed December 31, 2025, https://www.energy.gov/sites/prod/files/2019/10/f68/fcto-h2-at-ports-workshop-2019-vii2-hansen.pdf

28. Revolutionizing hydrogen power generation with Ballard and Element 1, accessed December 31, 2025, https://blog.ballard.com/powergen/revolutionizing-hydrogen-power-generation-ballard-element-1

29. Scripps zero-emission hydrogen hybrid research vessel - UNOLS |, accessed December 31, 2025, https://www.unols.org/sites/default/files/202211fic_apV.pdf

30. Future Fuels in the Maritime Sector – Building the Bridge to Hydrogen - Holland & Knight, accessed December 31, 2025, https://www.hklaw.com/en/insights/publications/2021/04/future-fuels-in-the-maritime-sector-building-the-bridge-to-hydrogen

31. USCG Issues New Guidelines for Bunkering Vessels Using LNG and Alternative Marine Fuels - United States Coast Guard News, accessed December 31, 2025, https://www.news.uscg.mil/maritime-commons/Article/4257299/uscg-issues-new-guidelines-for-bunkering-vessels-using-lng-and-alternative-mari/

32. Risk assessments required for alternative fuel bunkering in the US | NorthStandard, accessed December 31, 2025, https://north-standard.com/insights-and-resources/resources/news/risk-assessments-required-for-alternative-fuel-bunkering-in-the-us

33. US Coast Guard issues new guidelines for alternative fuels bunkering operations, accessed December 31, 2025, https://www.manifoldtimes.com/news/us-coast-guard-issues-new-guidelines-for-alternative-fuels-bunkering-operations/

34. Design of world's first hydrogen-hybrid research vessel approved - Arches H2, accessed December 31, 2025, https://archesh2.org/design-of-worlds-first-hydrogen-hybrid-research-vessel-approved/

35. UC San Diego Receives $35 Million in State Funding for New California Coastal Research Vessel, accessed December 31, 2025, https://scripps.ucsd.edu/news/uc-san-diego-receives-35-million-state-funding-new-california-coastal-research-vessel

36. accessed December 31, 2025, https://hydrogenindustryleaders.com/federal-funding-cut-halts-scripps-hydrogen-hybrid-research-vessel-project/#:~:text=In%20recent%20months%2C%20Scripps%20had,secretarial%20memorandum%20on%20financial%20responsibility.

37. Secretary Wright Announces Termination of 24 Projects, Generating Over $3 Billion in Taxpayer Savings | Department of Energy, accessed December 31, 2025, https://www.energy.gov/articles/secretary-wright-announces-termination-24-projects-generating-over-3-billion-taxpayer

38. Governor Newsom statement on Trump administration's decision to cut hydrogen hub funding, accessed December 31, 2025, https://www.gov.ca.gov/2025/10/01/governor-newsom-statement-on-trump-administrations-decision-to-cut-hydrogen-hub-funding/

39. DOE's Project Cancellations Slam US Industries - Sierra Club, accessed December 31, 2025, https://www.sierraclub.org/articles/2025/10/doe-s-project-cancellations-slam-us-industries

40. RFP: Ship Design, Assembly of CCRV - Sea Technology magazine, accessed December 31, 2025, https://sea-technology.com/uc-san-diego-scripps-institution-of-oceanography-rfp-final-design-assembly-coastal-class-research-vessel

41. LA's oceanfront power plant is a test of clean-energy ambitions in the new Trump era - CalMatters, accessed December 31, 2025, https://calmatters.org/environment/2025/10/scattergood-hydrogen-crossroads-ladwp/

42. Understanding the Governor's 2025-26 State Budget Proposal, accessed December 31, 2025, https://calbudgetcenter.org/resources/understanding-the-governors-2025-26-state-budget-proposal/

43. REGULATORY - American Bureau of Shipping (ABS), accessed December 31, 2025, https://ww2.eagle.org/content/dam/eagle/regulatory-news/2025/regulatory-trends-2025.pdf

44. Potential of Hydrogen as Fuel for Shipping - Maritime Cyprus, accessed December 31, 2025, https://maritimecyprus.com/wp-content/uploads/2023/12/Report-Potential-of-Hydrogen-as-fuel-for-shipping_c.pdf

45. Total Cost of Ownership (TCO) Analysis for Hydrogen Fuel Cells in Maritime Applications: Preliminary Results - Department of Energy, accessed December 31, 2025, https://www.energy.gov/sites/prod/files/2019/10/f68/fcto-h2-at-ports-workshop-2019-viii5-ahluwalia.pdf