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Submergence Group & M Subs Ltd are sister companies that specialize in the design, manufacture, and operation of manned and unmanned submersibles for military and commercial markets. Operating from Plymouth (UK) and Round Rock Texas, our experienced team possesses skills in mechanical and electrical engineering, composites design and manufacture, electronics and software design, and offshore operations.

Manned Submersibles

MSubs Ltd (Marlin Submarines Ltd.) has designed, built, and operated specialized submersibles supporting diver lock-out and long-endurance operations as scientific research vessels and military vessels since 1986. Assembly and testing is performed by a combined team of MSubs engineers, and technicians, and Submergence Group’s pilots, operators, and maintenance experts.   Read more >

DCS Manned Submersible

Unmanned Submersibles

MSubs’ Unmanned Underwater Vehicles (UUVs) hull designs are based on our manned submersibles, enabling most systems and components to be within the pressure hull.  This enables MSubs UUV’s to be maintained and replenished without recovery, reducing turnaround time.  UUVs can be operated manned or unmanned, using Submergence Group’s SUBNAVSYS integrated bridge system.   Read more >

Engineering & Design Services

  • Pressure Vessel Design and Construction
  • Control and Navigation
  • HP Gas and Hydraulics
  • Life Support
  • GRP Tooling
  • DC Motive Power Systems

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DCS manned submersible hatch cover

Operations & Support

Submergence Group operates our submersibles world-wide.   Our expert pilots and engineers have extensive military and/or commercial submersible experience and provide operational cadre for testing new submersibles, and train / qualify customer pilots and engineers on all aspects of submersible operations and maintenance.   Read more >

S351 Manned submersible test dive
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Submergence Group & MSubs Ltd