With her stern protruding from the waves, Thetis remained undiscovered for a whole day and, although four men managed to escape, she became a tomb for the 99 men on board - despite the efforts of rescuers.
Triumph was lost on active service in the Aegean Sea in January 1942.
When Thetis was raised in November 1939, an investigation into the cause of this tragic accident revealed an incorrectly-wired bow cap indicator - showing the bow cap to be shut when it was open - and that the vital test cock was blocked with paint. To avoid any suggestion of a jinx on the boat, the Admiralty
