MSubs Ltd.

MSubs Ltd and its sister company Submergence Group specialise in the design, manufacture, and operation of manned and unmanned vehicles for military and commercial markets. The business runs out of Plymouth, UK, and Roundrock, Texas, with a team whose skills cover mechanical and electrical engineering, composites design and manufacture, electronics and software design, and offshore operations. Across its manned systems, MSubs has designed, built, and operated specialised submersibles for diver lock-out and long-endurance missions, including use as scientific research vessels and military vessels. The company assembles and tests those systems with engineers, technicians, pilots, operators, and maintenance experts, so its work extends beyond fabrication into operational readiness and support. For unmanned systems, MSubs develops unmanned underwater vehicles based on its manned submersible hull designs. That approach places most systems and components within the pressure hull, which allows the vehicles to be maintained and replenished without recovery and reduces turnaround time. Those vehicles can be operated manned or unmanned using Submergence Group's integrated bridge system. The unmanned range extends to fully autonomous surface vessels and hybrid and surface vehicles, so the company's unmanned activity is not limited to underwater craft. MSubs offers engineering and design services covering pressure vessel design and construction, control and navigation, high-pressure gas and hydraulics, life support, GRP tooling, and DC motive power systems. Between them those services span the full technical stack of submersible and vehicle development, from structural and pressure-related design through control systems, onboard atmosphere management, tooling, and power systems. On the operations and support side, Submergence Group operates the submersibles worldwide, provides experienced pilots and engineers, supports testing of new submersibles, and trains and qualifies customer pilots and engineers in operation and maintenance. Taken together, the business covers vehicle design, manufacture, testing, operation, and support for underwater and surface systems across defense, research, and commercial use cases.