Article 5
Whenever a Contracting Party is aware of a casualty or the presence of oil or other harmful substances in the North Sea area likely to constitute a serious threat to the coast or related interests of any other Contracting Party, it shall inform that Party without delay through its competent authority.
The Contracting Parties undertake to request the masters of all ships flying their flags and pilots of aircraft registered in their countries to report without delay through the channels which may be most practicable and adequate in the circumstances:
all casualties causing or likely to cause pollution of the sea;
the presence, nature and extent of oil or other harmful substances likely to constitute a serious threat to the coast or relating interests of one or more Contracting Parties.
The Contracting Parties shall establish a standard form for the reporting of pollution as required under paragraph 1 of this Article.