HII, a global leader in autonomous unmanned maritime systems, has been awarded an option year production contract for the U.S. Navy’s next-generation program of record, the Lionfish small unmanned undersea vehicle (SUUV). Lionfish is based on HII’s commercial REMUS 300 platform, originally developed as part of a rapid prototyping initiative in collaboration with the U.S. Navy and the Defense Innovation Unit (DIU).

Designed to address a broad range of undersea warfare missions, Lionfish supports mine countermeasures, intelligence, surveillance and reconnaissance (ISR), anti-submarine warfare, and electronic warfare operations.

This latest option year contract continues to build the momentum of the Lionfish program, which marked a major production milestone at the close of 2025 with the completion of the 42nd Lionfish vehicle at HII’s Pocasset facility. The five-year program could scale to as many as 200 vehicles, with a total contract value exceeding $347 million.