Police are concerned unidentified bodies may lie beneath the Timor Sea, after a fishing trawler pulled up part of a yacht in its nets.
The mystery yacht, which may have links to Sydney and New Zealand, was discovered by a ship owned by Australia Bay Seafoods in about 90m of water last week.
Co-owner of the company Bill Passey said the crew of the ship realised their nets had a giant snag last week while trawling about 170kms from Darwin.
"They hooked up there and it took about six hours to get off and eventually when they did get off something gave way," Mr Passey told the ABC.
"They pulled up ... and amongst all the tangled mess was a sail and a mast off a yacht," he said.