Surrendering woudl be a last ditch thing, but woudl certianly be better than dying when you know you COULD surface and abandon ship.
As for adandoning, several times I have been limping home with severe damage for either the engines to compeltely pack up or the sub to succumb to flooding when in reality I woudl have been towed home being so close to base (once I as through the antisub netting but not quite past the harbour wall when I sank). Be nice to have the option to call for a pickup / tow.
As for chaps falling overboard, I'd like the option to crash dive even if the watch were not yet in the sub - I'd rather lose a watch crew than lose my entire crew if they didnt spot tht DD RIGHT NEXT TO US
V