MSubs is a vertically integrated R&D engineering SME based in Plymouth, Devon, specialising in the design, manufacture and delivery of advanced crewed and uncrewed underwater platforms. The company provides practical subsea capability across defence, research and commercial applications.
With a strong heritage in submersible design, development and manufacture, MSubs has established a highly respected reputation for delivering reliable, complex engineering solutions. Its multidisciplinary team of mechanical, electrical and robotics engineers support the development of multiple generations of underwater systems, combining technical depth with hands-on delivery.
Operating across the full lifecycle, from concept and design through to build, integration and testing, MSubs’ rapidly responds to evolving requirements and the delivery of tailored, operationally relevant solutions.
This organisation has expanded into a broader group capability spanning autonomy and surface platforms, contributing to programmes such as the Mayflower Autonomous Ship, demonstrating real-world autonomous capability.
Through sister companies MarineAI, specialising in maritime World leading Level 4 autonomy software, and ZeroUSV, designers and manufacturers of uncrewed surface vessels including the Oceanus12 and Oceanus17, the group delivers integrated maritime systems, playing a central role within Plymouth’s National Centre for Marine Autonomy (NCMA).
A recent example of MSubs’ capability is XLUUV Excalibur, a large-scale uncrewed underwater platform that reflects the company’s ability to design and deliver complex systems with timely precision and on budget.
MSubs is proud to be a Gold Sponsor of Ocean Tech Expo 2026. As designers and manufacturers of advanced submersible platforms based in Plymouth and part of the wider ecosystem surrounding the National Centre for Marine Autonomy, supporting events that bring together the marine technology sector is more relevant than ever.
Find out more and book your place for Ocean Tech Expo here.
