Convention on the Protection of the Underwater Cultural Heritage
The Convention on the Protection of the Underwater Cultural Heritage is a treaty that was adopted on 2 November 2001 by the General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO). The convention is intended to protect "all traces of human existence having a cultural, historical or archaeological character" which have been under water for over 100 years.
Source: Wikipedia — Convention on the Protection of the Underwater Cultural Heritage (CC BY-SA 4.0)