I've just returned home from a very pleasant conversation with an Australian colleague who has informed me that during WW2 her Austrian father was an officer with the U-boat service. She's keen to know more and I'd be interested as to verification of a point she mentioned which I've never heard of before i.e. SOP was for senior officers in the U-boat service to evacuate boats in the event of extreme danger so as to preserve the expertise. I've read the account by Herbert Werner (Iron Coffins) but I've never heard of this before. Is there anyone much more enlightened than myself who can shed any light on this statement?