Fires are still burning on an oil tanker carrying jet fuel and a cargo ship carrying highly toxic chemicals that collided in the North Sea on Monday morning.
One crew member is still unaccounted for and the search has been called off, HM Coastguard said.
The collision involved the US-registered Stena Immaculate - which was transporting fuel on behalf of the US military - and the Portuguese-flagged Solong.
Coastguard Divisional Commander Matthew Atkinson said 36 people had been rescued, with one person taken to hospital. The missing crew member had been onboard the Solong, he said.
The Marine Accident Investigation Branch said a team of inspectors and support staff had started gathering evidence and was undertaking a preliminary assessment to determine its next steps.
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