Age of the crew members?
How old are the various crew supposed to be, and do they look to be a realistic representation of how U-boat crews really were?
My estimates are:
Captain: 38
Chief: 33
1st officer: 25
2nd officer: 23
Lt Werner: 27
Kid with pregnant gf: 15
Yohann: 28
Thomsen: 35
Then the rest of them look to be about college age.