Professional submarine

Mobile Undersea Systems Test Laboratory (MUST) was built by Lockheed Martin in the 1980s to conduct scientific research underwater. The vessel operated for a few years before being decommissioned and left in a 'boneyard', where it remained until recently. In 2012 MSubs performed a rapid refit of the vessel, replacing the entire electrical system and restoring the hull and exterior systems in a 3 month period. Once complete, MUST underwent sea trials from Plymouth Sound, followed by her first commercial operation.