Any other U-boat crew would cut his throat at this moment, then surrender.

The result was what the U-boat crews called their second happy time, which did not end until convoys were introduced.

These may be secret weapons, but they are still U-boats, and U-boat crews do not live long.

Improved anti-submarine warfare meant that the life expectancy of a typical U-boat crew would be measured in months.

Usual U-boat crews are anywhere from 16 to 20.

Of the U-boat crew of 52, 8 were killed and 44 survived.

The hard-pressed U-boat crews were at least to lack for nothing in harbour.

They were initially so successful that this became known among U-boat crews as the second happy time.

It was awarded to recognize U-boat crews who had completed three war patrols.

After her third patrol, U-28 became a training vessel and was used to bring new U-boat crews up to standard.