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British tycoon adventurer Sir Richard Branson plans to build an aeroplane-like submarine capable of doing underwater loops as it goes deeper than any submarine has ever been.
The Herald Sun reports the Virgin Atlantic boss hopes the submarine with fighter jet technology will explore uncharted depths at 10,600m.
The current £415,000 ($749,000) carbon fibre prototype Necker Nymph will swoop 40m under the surface with a stronger version planned for depths beyond current submarine limits.
Sir Richard said: "It is very similar to an airplane flying in the sea. You can literally do loop-the-loops."
It could eventually reach the Mariana Trench, believed to be the world's lowest spot in the Pacific Ocean.
US company Hawkes built the 5m "winged" sub which has three 360-degree view cockpits and is steered like a plane with a joystick.
Film director James Cameron used one of their subs to look for underwater inspiration for his 3D blockbuster ‘Avatar’.
