As a lurker of these awsome forums I finally speak. This has been an interesting thread for me.
Recently I watched a documentary on the U-864 that was sank off of Norway by the Brit sub Venturer. It is not so much the ordinance that is of concern but the 65 tons of mercury that she was carrying.
I have read a couple articles implying that the Germans used mercury for levelling off the boats faster. This particular Uboat was heading to Japan with the mercury (along with rocket parts and scientists, not gold and Hitler's last will and testemant).
A verry interesting tale for sure. Ran aground by an inexperienced skipper, repaired, then engine problems that made her a sitting duck for Commander Jimmy Launders and the Venturer crew. Firing four fish at the sounds of the damaged U-boat and hitting with only the fourth one.
http://www.iht.com/articles/2007/01/11/news/norway.php
http://www.spiegel.de/international/...455652,00.html