Hefty trajectory: The Swedish diving team noted a 985-foot flattened out 'runway' leading up to the object, implying that it skidded along the path before stopping but no true answers are clear

Diver Peter Lindberg said: 'We have experienced things that I really couldn’t imagine and I have been the team's biggest skeptic regarding these different kind of theories.

'I was kind of prepared just to find a stone or cliff or outcrop or pile of mud but it was nothing like that, so for me it has been a missing experience I must say.'

Member Dennis Åsberg said: 'I am one hundred percent convinced and confident that we have found something that is very, very, very unique.

'Then if it is a meteorite or an asteroid, or a volcano, or a base from, say, a U-boat from the Cold War which has manufactured and placed there - or if it is a UFO...

'Well honestly it has to be something.'