On February 11, 2015 M Subs Ltd (a subsidiary of Submergence Group LLC) launched the prototype manned submersible, S351-UOES2 in Plymouth, UK. The submersible, christened Margaret, is the culmination of three years of research and development and is one of two prototypes being evaluated by USSOCOM. Margaret will undergo several months of sea trials, be certified by Det Norske Veritas -Germanischer Lloyds and then be delivered to USSOCOM for extensive trials and evaluation.

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