Titanic Shipwreck

Shipwrecks and the law
Shipwreck law determines important legal questions regarding wrecks, perhaps the most important question being the question of ownership. Legally wrecks are divided into wreccum maris (material washed ashore after a shipwreck) and adventurae maris (material still at sea); although some legal systems treat the two categories differently, others treat them the same.
Wrecks are often considered separately from their cargo. For example, in the English case of the Lusitania QB 384 it was accepted that the remains of the vessel itself were owned by the insurance underwriters who had paid out on the vessel as a total loss by virtue of the law of subrogation (who subsequently sold their rights), but that the property aboard the wreck still belonged to its original owners (or their descendants).
Military wrecks, however, remain under the jurisdiction–and hence protection–of the government that lost the ship, or that government's successor. Hence, a German U-boat from World War II still technically belongs to the German government, even though the Third Reich is long-defunct. Many military wrecks are also protected by virtue of their being war graves.