BritinBritain
Per Ardua Ad Astra
2) This is not a fact : it is your interpretation,which is wrong :at the end of the war the losses were virtually zero because the escots were to strong and it would be suicidal to attack a convoy .
I REALLY don't know if you are deaf, daft or stupid.
On February 1, 1942, the Kriegsmarine switched the U-boats to a completely new Enigma key (TRITON), which used special upgraded Enigma machines. This new key could not be read by codebreakers; the Allies no longer knew where the U-boat patrol lines were. This made it far more difficult to evade contact, and the wolf packs ravaged many convoys. This state persisted for ten months. To obtain information on submarine movements the Allies had to make do with HF/DF fixes and decrypts of Kriegsmarine messages encoded on earlier Enigma machines. These messages included signals from coastal forces about U-boat arrivals and departures at their bases in France, and the reports from the U-boat training command. From these clues, Commander Rodger Winn's Admiralty Submarine Tracking Room[50] supplied their best estimates of submarine movements, but this information was not enough.
Then on October 30, crewmen from HMS Petard salvaged Enigma material from German submarine U-559 as she foundered off Port Said. This allowed the codebreakers to break TRITON, a feat credited to Alan Turing. By December 1942, Enigma decrypts were again disclosing U-boat patrol positions, and shipping losses declined dramatically once more.
THEREBY PROVING THE LINK BETWEEN CONVOY LOSSES AND ENIGMA