| http://www.w3.org/ns/prov#value | - None of these were truly effective however, and by 1943 Allied air power was so strong that the U-boats were being attacked right in the Bay of Biscay as they left port.Development of torpedoes also improved, such as FAT, which ran a pre-programmed course criss-crossing the convoy path, and the 'German Navy Acoustic Torpedo' ('GNAT'), which would home on the propeller noise of a target.
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