Believing their ship had sunk, none of U-110's survivors knew about Balme’s boarding party. (They had been quickly brought below deck on the rescue ship.) Four hundred men from the British Royal Navy knew, but not one said a word about U-110's treasure until after the war was over.
Initially towing U-110 back to Iceland, the Royal Navy crews knew their find would be useless if Germany learned U-110 had been captured, not sunk. Had they learned the truth, the Germans would have changed their system immediately and British code breakers would have been unable to make good use of the sealed June codes David Balme had found.
Whether for that reason, or merely because she took on water, U-110 sank during the trip to Iceland. The Enigma machine and all supporting data were
turned over to Alan Turing and his team at
Bletchley Park, near London.