2 ships collide in open sea .who will investigate ? what if none of the coastal state is threatened by pollution ?

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MATTER TO BE INVESTIGATED BY FLAG STATE .IF CASE OF POLLUTION THAN MATTER IS INVESTIGATED BY FLAG STATE OR CAOSTAL STATE CONCERNED BUT ON COMPLAINT BASIS

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Protocol intervention comes in picture the ship is not fined by any coastal state  but the flag state takes action against the vsl

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only the flag state of the vessel which involved in colision will investigate