Wow ..
a XXI boat is a deadly machine in hands of a skilled commander .
" on 4th May, U-2511 detected a
Suffolk class cruiser,
HMS Norfolk, with destroyer escort at a long range. She made a text-book approach, closing at high-speed first, then diving deep and passing the destroyer screen at silent-speed. Finally, Schnee had the cruiser in sights 500 meters away with a perfect attacking position inside the destroyer screen and undetected- impossible not miss. U-2511 did not fire but dived deep again, and still undetected returned to base, arriving at Bergen on 5th May 1945.