[Jimbuna]

Originally Posted by Bilge_Rat

At 10-12 knots, the U-Boat would have been blind, since the periscope vibrated too much at speeds over 5-6 knots to be used and the noise of the diesel would have made the hydrophones useless. Seems like a foolish thing to do in daytime.

Agreed, she was lost 12 days into her commanders first patrol:

http://www.uboat.net/men/commanders/10.html

http://www.uboat.net/boats/u297.htm