Inventor Peter Madsen is alleged to have scurried vessels off sea-coast of Denmark that Kim Wall had been aboard

An amateur submarine maker is in custody in Copenhagen as police analyse the disappearance of a Swedish columnist who had been onboard his vessel before he is alleged to have purposely dropped it off Denmarks east coast.

Peter Madsen, a Danish inventor whose crowdfunded submarine Nautilus sank near Copenhagen on Friday, was apprehended on preliminary manslaughter accusations but has denied responsibility for the fate of 30 -year-old Kim Wall.

He allegations she disembarked on an island about three-and-a-half hours into their trip on Thursday night, according to Copenhagen police.

Police spokesman Jens Mller Jensen said on Sunday that the submarine had been raised from the sea couch and searched but no torso had been discovered. The search for Wall in the water, from the air and on ground, continues.

Mller Jensen added that there were indications that Madsen purposely sank his submarine.

On Saturday, after a two-hour custody hearing held in private, Judge Kari Srensen ordered that Madsen be held in pre-trial detention for 24 periods while the investigation into Walls disappearance continued.

Prosecutor Louise Pedersen mentioned Madsen faced a preliminary manslaughter accuse for having killed in an unknown lane and in an unknown place Kim Isabell Frerika Wall of Sweden sometime after Thursday 5pm.

Madsens defence lawyer, Betina Hald Engmark, said her patron preserves his innocence. He is willing to cooperate and hasnt decided whether to appeal the detention ruling, Hald Engmark told.

Wall, a freelance columnist, had been writing about Madsen and his submarine at the time of disappearing, according to Swedish and Danish reports.

Swedish columnist Kim Wall was writing about Peter Madsen and his submarine. Photograph: Tom Wall/ EPA

It is with great dismay that we received the news that Kim went missing during an assignment in Denmark, their own families said.

She lives between New York and Beijing, the family mentioned, and has written for names including the Guardian, New York Times, South China Morning Post and Vice. Her LinkedIn page mentions she writes about identity, gender, pop-culture, social justice, foreign policy and the undercurrents of rebellion.

Madsen made headlines when he successfully financed the building of the 40 -tonne, 18 -metre Nautilus through crowdfunding, completing it in 2008.

He appeared on Danish television on Friday to discuss the submarines sinking and his salvage. Footage aired on Denmarks TV2 channel demonstrated him getting off what appeared to be a private barge and making a thumbs-up sign as he walked away. I am fine, but sad because Nautilus went down, he told TV2.

Danish police say they have not received the body of a missing Swedish journalist within the submarine that sank off the eastern coast last week. Photograph: Jacob Ehrbahn/ Ritzau Foto via AP

Madsen said a minor problem with a ballast tank turned into a major issue that is likely induced the sinking of the vessel, considered to be the largest privately-built submarine of its kind. The ballast tank is a bay that holds sea to provide stability.

It took about 30 seconds for Nautilus to drop, and I couldnt close any hatches or anything, Madsen mentioned. But I guess that was pretty good because I otherwise still would have been down there.

Swedish police told afterwards in the day that they were investigating the whereabouts of Wall, who they said had been on the submarine at some point. Whether the woman was on board the submarine at the time of her disappearance is unclear, police said.

A navy spokesman, Anders Damgaard, said: He told us that the writer who also had been on board had been dropped off on Thursday evening. They were the only two on board yesterday.

Submarine owned and inventor Peter Madsen. Photo: Bax Lindhardt/ EPA

Authorities were alerted to issues with the voyage when Walls boyfriend reported her missing early on Friday. Two helicopters and three ships searched the sea from Copenhagen to the Baltic Sea island of Bornholm.

The navy initially said the craft was determined sailing south of Copenhagen. But Damgaard later said the 40 tonne submarine had sunk.

Kristian Isbak, who had responded to the navys call to help situate the ship, sailed out immediately Friday and read Madsen standing wearing his trademark military fatigues in the submarines tower while it was still afloat.

He then climbed down within the submarine and there was then some kind of air flow coming up and the submarine started to drop, Isbak mentioned.[ He] came up again and stayed in the tower until water came into it, before swimming to a nearby barge as the submarine sank, he added.

Madsen told us he had technical difficulties to explain why the submarine failed to respond to radio contact, Damgaard said.

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