no hope of an AMA in case you were wondering, he died in 2005 I'm afraid
Funny coincidence this. While I have no knowledge personally, the BBC have recently broadcast a show about this exact subject. [PQ17: An Arctic Convoy Disaster] ( http://www.bbc.co.uk/programmes/b03n3297) actually touches on your question and describes in great detail the experience of such a captain. A fascinating documentary and well worth a watch if you can stream it.