A sleek superyacht has docked at Portland.

The Obsidian arrived in a windy Portland Harbour as Storm Debi swept across the UK.

The 84.2-metre superyacht has a distinctive sleek and elegant design with a silvery hull and bow to stern glazing, and the only thing known of its owner is that they are a billionaire.

Obsidian was built this year in the Netherlands by Feadship and is thought to be the first biofuel-powered superyacht.

A spokesperson for Portland Port said: “Vessels may, from time to time, use the port to shelter whilst awaiting a weather window.”

Dorset Echo: Obsidian in Portland MarinaObsidian in Portland Marina (Image: Geoff Moore)

Pictures by Geoff Moore/Dorset Media Service

One of the key features of the vessel's design is the atrium staircase leading to a lower deck dining saloon where the entire wall opens to a terrace view just above sea level.

There is also a very impressive stern aqua lounge with large windows below water level, as well as fold-out balconies towards at her stern which provide a spacious beach club area that extends to sea level.

The jaw-dropping super-yacht can accommodate up to 14 guests in its seven staterooms and was designed by RWD, in collaboration with MONK Design in Holland.

RWD has designed 42 yachts and designed the interior of 63 yachts; Monk Design has designed two yachts and designed the interior of four yachts.

Dorset Echo: Obsidian in Portland MarinaObsidian in Portland Marina (Image: Geoff Moore)

Her top speed is 17.0 knots and she boasts a maximum range of 5500.0 nautical miles when navigating at cruising speed, with power coming from four Caterpillar diesel electric engines.

Obsidian is currently sailing under the Cayman Islands flag, which is the second most popular flag state for super yachts.

It arrived in the marina on Sunday, November 12 from Amsterdam.