The Multi-Role Ocean Surveillance Ship (MROSS) is a type of research and surveillance ship in development since 2021 for the United Kingdom's Royal Fleet Auxiliary.[1] The first ship, RFA Proteus, is a commercial ship converted to the role which entered service in October 2023.[2] The second ship is planned, potentially as a new build vessel. Both ships are to be used by the RFA to research and protect critical undersea national infrastructure, such as undersea cables and gas pipelines, in both British and international waters.
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