 The commercial exploitation of underwater cultural heritage for trade or speculation or its irretrievable dispersal is fundamentally incompatible with the protection and proper management of underwater cultural heritage . Underwater cultural heritage shall not be traded , sold , bought or bartered as commercial goods . This Rule cannot be interpreted as preventing : ( a ) the provision of professional archaeological services or necessary services incidental thereto whose nature and purpose are in full conformity with this Convention and are subject to the authorization of the competent authorities ; 
