 They also say that , " ICMM members should recognize that artefacts from underwater sites are integral parts of archaeological assemblages , which should remain intact for research and display " and that , " a commercially exploited heritage site is one in which the primary motive for investigation is private financial gain . " The United Nations Educational , Scientific and Cultural Organization ( UNESCO ) ratified a set of rules for preserving and excavating underwater sites at the Convention on the Protection of the Underwater Cultural Heritage during 15 October — 5 November 2001 . Though the rules set out at the meeting do include preserving artefacts in situ as the preferable option they go on to say : 
