Fleetzero, Thoma-Sea, and Glosten Collaborate on Long-Duration USVs Maritime Activity Reports, Inc. June 2, 2026 Source: Fleetzero Fleetzero, a U.S.-based developer of marine technology, has announced a collaboration with Thoma-Sea Marine Constructors, a leading U.S. shipbuilder, and Glosten, a Seattle-based global naval architecture and marine engineering firm, to accelerate the development and deployment of integrated autonomous vessel solutions for commercial maritime, government, and defense customers. The partnership brings together Fleetzero's Leviathan™ Battery Energy Storage System, propulsion technologies, and autonomy stack, with Thoma-Sea's domestic shipbuilding capacity and Glosten's vessel design expertise. The three companies are developing a tightly integrated autonomous diesel-electric vessel engineered for use in contested waters, persistent operations, and supply delivery with minimal radar cross-section. Its angular design draws inspiration from low-profile and stealth vessels in military use today and elevates the propulsion technology for long-range, low-signature missions. The combined capability has been refined through demonstrations and engineering work with organizations across the maritime sector, and is engineered to address requirements outlined in areas of interest for the Defense Innovation Unit (DIU) and other Department of War stakeholders. The collaboration aligns with Department of War, MARAD, and Coast Guard priorities, including the Modular Open Systems Approach (MOSA). The combined platform addresses a wide range of operational needs, including autonomous and remotely operated cargo operations; persistent ISR, patrol, and contested logistics missions; electrified harbor craft, tugs, and coastal vessels Improved operator safety and domestic-content, Jones Act, and Buy American compliance. Fleetzero's autonomy strategy began with improving the propulsion system, a key enabler for eliminating maintenance required while in autonomou