From: Paul Lawton
Warships remain the property of the sovereign nation under whose flag they sailed. A navy can only relinquish ownership of a warship wreck when they execute documents of abandonment, or sell it off for scrap or salvage, etc. Regarding the U-boats that surrendered at Portsmouth after Germany's surrender, under international treaty, all of the Allied nations were to dispose of those warships by a particular date (I forget exactly when) in 1947. Those treaty terms were abrogated to a certain extent by a few nations, particularly the US and USSR. Most in Britain were scuttled, the ones in the US were sunk in navy weapons test (mostly torpedo tests) except for the Type IXD2 U-234 (Kapitanleutnant Friedrich Steinhoff) which was sold to a scrap firm in New York. The reason why the U-505 was allowed to be retained and ended up at the Museum of Science and Industry in Chicago, is because she did not surrender, but was captured, and under international law, could be kept by the capturing naval force. Relative to the U-853 and the question of whether she could have held out until after Germany's surrender,that is a good question, but I think that if she were captured, she would have been treated as the boats that surrendered at Portsmouth, Because she is a navy grave however, she is further protected under international law, and is supposed to be protected by the nation in whose waters she lies. As you know, that has not proven to be of any degree of protection to the 853. An interesting note on the 853 however, is the fact that it appears that the German government (I believe in the early 60s) actually contracted with a salvage firm to raise her. That is a strange twist to the scenario, but I believe the terms of the agreement were contingent. The salvage form has to actually raise her and send back the human skeletal remains and personal effects to the Federal Republic of West Germany for proper disposition, before the wreck would have been abandoned by the FRoWG, and title could have passed to the salvage company. International Admiralty and salvage laws change occasionally, but when it comes to warships, things have pretty much been unchanged.