Godt å se enda en Nordmann her!!
I think someone asked a similar question, about a place in the mediterranean!
I'll look for the thread, and post the link. They found out that "dangerous waters" (the game) had very good depth indications and was usable for finding this out..!
Try looking here, mate:
http://www.subsim.com/radioroom/showthread.php?t=102744
And welcome to Subsim!