COPENHAGEN (Reuters) - Danish police said on Sunday they had found nobody in the wreck of a submarine owned by an inventor charged with the manslaughter of a woman who had been on board - but added the vessel seemed to have been deliberately sunk.

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Police have said that Swedish journalist Kim Wall, 30, is missing after taking a ride on Peter Madsen’s homemade 17-metre sub, which sank on Friday morning. Madsen was rescued by the navy.

Madsen, 46, has been ordered to be held in custody for 24 days, accused of Wall’s manslaughter.

The vessel was recovered on Saturday from Koge Bay, south of Copenhagen, where it had been lying at a depth of seven meters, and taken into harbor. Police searched it late on Saturday and early on Sunday.

“There are no persons in the submarine, dead or alive,” Jens Moller, head of Copenhagen Police’s homicide unit, said at a news conference on Sunday.

He said it appeared to have been deliberately scuttled, and was still being treated as a possible crime scene.

Madsen, an entrepreneur, artist, submarine builder and aerospace engineer, went before a judge on Saturday behind closed doors for preliminary questioning. His defense lawyer, Betina Hald Engmark, told Reuters he denied the charges.

Police said on Friday the inventor had told them he dropped Wall off from his submarine in Copenhagen on Thursday night. On Sunday they said they had since been given another explanation by Madsen, but declined to elaborate.

Police in Sweden said they had tried without success to contact Wall by phone and that her family had not heard from her.

The submarine, UC3 Nautilus, is one of three constructed by Madsen. It can carry eight people.