German technical developments, such as the "Schnorchel", attempted to counter these. She would have been constructed with the final version of the "schnorchel". She was one of the U-boats that used the Schnorchel underwater breathing apparatus. The attack periscope was found to have been extended, along with the schnorchel. The crew was given leave while the boat was overhauled and the "Schnorchel" was fitted. For the test the schnorchel replaced the aft periscope. She was fitted with a Schnorchel underwater breathing apparatus in November 1944. The "Schnorchel" reduced the need to spend dangerous periods on the surface recharging batteries. A Deschimag Type I schnorchel was fitted in December. She was fitted with a Schnorchel underwater-breathing apparatus in April 1944. She returned to La Pallice to be fitted with a "Schnorchel" underwater-breathing apparatus. The submarine was fitted with a Schnorchel underwater-breathing apparatus in March 1944. In April 1944 the U-boat was fitted with a "Schnorchel" underwater-breathing apparatus. "U-1014" had Schnorchel underwater-breathing apparatus fitted out before January 1945. Between 6 June and 31 August 20 out of 30 "Schnorchel" boats were lost.