Weserübung Axis-problem
 

How should I "take the U-Boat crew"? Which keys shlould I use for completion of this mission?

Rescue the U-Boat Crew
 

I read in the link below that if you take command of the destroyer and park it right beside the sub, you should get a mooring message and this will offload the sub crew. I hope this answers the question.

www.simhq.com/_naval/naval_028b.html

Thank you Ensign Dunsel! Very helpful.