Enigma machine
"Somali" was the leader of the 6th Destroyer Flotilla and spent most of the winter of 1940–41 screening Home Fleet sweeps. In May 1941, "Somali" boarded the German weather ship "München". Prior to being boarded, the crew of "München" threw overboard the ship's Enigma machine in a weighted bag. However, documents on the operation of the Enigma machine were left on board, as were vital codebooks providing a breakthrough for Allied codebreakers.