Chilean navy divers have confirmed there have been no breaches in the fuel tank of the sunken wellboat Seikongen.
The 2,500-dwt live fish carrier (built 2017) went down off Puerto Montt on Wednesday.
It is carrying 67,000 litres of bunkers, plus a cargo of 37,000 salmon.
The fish remain sealed in their tanks, but have died due to a lack of oxygen.