Thousands of shipwrecks lie across the world ocean floor. Along with the new technologies that reveal them to us, various controversial issues have emerged. Many of these ships have tremendous economic value; many reveal new evidence of shipbuilding techniques, armaments, and details of historic events; many have cultural, artistic, or academic value. While standards and international treaties have been developed for inventory and historical documentation, recovery, conservation, and commemoration, not all nations have signed on, leaving inconsistent outcomes for many shipwreck sites.