Operation Keyhole was a British special operation on Thule Island in the South Sandwich Islands during Operation Corporate in the 1982 Falklands War. The operation took place from 19–20 June 1982. Ten prisoners (one civilian and nine military personal) were evacuated to the tanker RFA Olmeda, accompanied by HMS Yarmouth. They departed for South Georgia. The Argentine Base Uruguay was closed and the buildings sealed to make them weatherproof.