HMS Undaunted (Lt. James Lees Livesey, RN) sailed from Malta on 1 May 1941 for a patrol of Tripoli, Libya. She was due to return to Malta on 11 May but she failed to do so and is presumed lost on mines. It is also possible that she was sunk by the Italian torpedo boat Pegaso which had sailed from Tripoli on the 12th. At 2030 hours that evening Pegaso signalled that she had attacked a submarine with depth charges and that a large patch of oil had been observed, an indication of the submarines destruction. Against this theory is the fact that by that date Undaunted should have been back at Malta but it is possible that a decision to remain at sea longer had been taken or that she had suffered mechanical problems preventing her return. It is also possible that she was sunk by the Italian torpedo boat Pleiade off Tripoli on the 13th but this is not very likely.