HMS Challenger (pennant number K07) was a Royal Navy diving support vessel, operational from 1984 to 1990.

[5] HMS Challenger was a unique vessel in Royal Navy service, purpose built to support deep sea operations and saturation diving.

Built by Scotts at Greenock, the ship was launched on 19 May 1981, but not commissioned until 1984, during a time when the Royal Navy was cutting back on expenditure.

In 1993 the ship was purchased by a company, Subsea Offshore, to be converted for work decontaminating hazardous waste dumped in the Baltic Sea and North Atlantic.

[4] The vessel was later bought by the Namibian Minerals Corporation (NAMCO), and fitted with equipment to recover diamonds from the sea floor.