MSubs specialises in the design, manufacture, and operation of manned and unmanned submersibles for military and commercial applications. Their portfolio includes crewed submarines, unmanned underwater vehicles (UUVs), and autonomous surface vessels. Notably, MSubs developed the Mayflower Autonomous Ship, aiming for the first fully autonomous transatlantic crossing. They also secured a £15.4 million contract to deliver the Cetus Extra-Large Uncrewed Underwater Vehicle (XLUUV) to the Royal Navy, enhancing the UK's autonomous underwater capabilities. Additionally, MSubs collaborates with partners such as Thales and Sonardyne to advance maritime autonomy and underwater technologies.