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This episode explores the intersection of energy requirements, autonomy, and defense technology in the maritime domain. The host and Dr. Andrew Nuss, Head of Growth and Strategy in the Maritime Division at Anduril, examine why the harsh conditions of saltwater and extreme ocean pressure make underwater robotic systems uniquely challenging compared to ground or air applications. They discuss the dominance of propulsion energy needs over onboard compute, the limitations of commercial off-the-shelf lithium-ion batteries, and the operational trade-offs of diesel-electric and buoyancy-based systems.
The conversation also highlights the friction caused by stringent defense certification processes, which can lag years behind commercial battery advancements. Nuss explains how emerging concepts like subsea and surface charging depots could dramatically reduce vehicle size requirements and extend mission reach. Finally, they explore the potential economic and operational drivers behind renewed interest in nuclear-powered commercial shipping and the supply chain realities of sourcing hardware for modern national security missions.
The host introduces the podcast and sets the context for discussing defense energy.
The host welcomes Dr. Andrew Nuss and outlines the episode’s focus on maritime defense energy.
Discussion of how maritime energy differs from land and air, emphasizing propulsion and harsh environments.
Exploration of pressure vessels, pressure‑tolerant cells, and alternative power sources like fuel cells and diesel.
Water Resistance Compared To Airdata
Seawater is about one thousand times more dense than air, which means propulsion in the maritime domain requires vastly more energy than aerial or ground robotics.
Buoyancy Engines And Their Limitsinsight
Gliders use simple buoyancy engines to move oil between bladders and dive long distances, but they lack sufficient onboard power to run heavy sensors.
Battery Packaging For Ocean Depthstrategy
Batteries for undersea vehicles must either be enclosed in heavy pressure vessels to remain dry or use epoxy-based pressure-tolerant modules to withstand extreme deep-sea pressure.
The Cost Of Defense Certificationinsight
Rigorous defense certification processes can take one to two years, resulting in significant opportunity costs by missing fast-moving commercial battery innovations.
Envisioning Subsea Charging Depotsstrategy
Establishing charging stations every 150 miles across surface and subsea domains could allow robotic systems to carry only 25% of their current energy load, shrinking vehicle sizes.
Commercial Shipping Speed Economicsinsight
Commercial ships currently operate at an optimal speed of 10 to 12 knots to conserve gas, but nuclear power could enable speeds up to 20 or 25 knots to compress delivery times.
Total Maritime Battery Market Sizedata
The current market size for the entire undersea and maritime vehicle market sits at roughly a couple hundred megawatt-hours, with industry watchers forecasting gigawatt-scale demand.
“Saltwater is particularly harsh for any robotic systems, plus the energy system, plus other capabilities that they require.”
“If you can, then great. If you can't, my presumption then is that like, energy density is by far the most important thing because you need, you want persistence and you know, you're space constrained, basically.”
“I think there's probably two things. One is compressing the time to take new batteries at the cell level and to be able to package them into applications that are suitable for the maritime environment.”
Dual-use technologies and the rise of defense tech are having a moment. But how does the defense sector approach innovations in energy that may be necessary to optimize its fleets? To help answer that question, Shayle turns to the maritime sector to explore how advanced batteries, nuclear propulsion, and autonomous capabilities are shaping the future of defense. Unlike conventional EVs, maritime vehicles and drones must compete with the challenges presented by the sea in order to complete surveillance and reconnaissance-related missions, as well as direct attacks. Saltwater corrodes hardware, and vehicles at great depths must withstand enormous pressure; to say nothing of the fact that moving through water requires nearly 1,000 times more energy than through air. To learn how the sector navigates these obstacles, Shayle sits down with Andrew Nuss, the head of growth and strategy in the maritime division at the defense technology company Anduril. They unpack topics including: - The complicated physics influencing maritime drone design and energy usage - How lithium-ion cells fare in deep-sea deployment - Why extreme reliability and long-range capabilities drive the military’s energy requirements compared to commercial shipping - How surface or subsea recharging depots could reshape vehicle design - Why both commercial and defense sectors are revisiting nuclear propulsion as a viable option for high-speed, zero-emission surface vessels Catalyst: The rise of metal fuels - Catalyst: GM’s big new battery tech push - Catalyst: Decarbonizing the high seas - Open Circuit: A five-alarm fire for the grid? - Latitude Media: Is adaptation ready for growth money? Credits: Hosted by Shayle Kann. Produced and edited by Max Savage Levenson. Original music and engineering by Sean Marquand. Stephen Lacey is our executive editor. Catalyst is brought to you by EnergyHub. Peak season puts every grid to the test — and the utilities that pass are the ones that built flexible capacity before they needed it. EnergyHub works with more than 170 utilities to coordinate 2.5 million devices and 3.4 gigawatts of dispatchable flexibility through a single platform designed to perform when it counts most. See what that looks like at https://www.energyhub.com/ Catalyst is brought to you by Bloom Energy. Bloom Energy fuel cells deliver affordable, ultra-reliable onsite power for hospitals, utilities, and data centers – at speed and at scale. Learn more by visiting https://www.bloomenergy.com/ This episode of Catalyst is brought to you by ENGIE, the smarter energy supplier. ENGIE doesn't just provide the power to run your business — they supply the energy to move it forward, with reliable, flexible solutions built for what's next. Learn more at https://www.engieresources.com/.
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