Sea trials have been carried out of one of the most unusual motor yachts ever built.

Sea trials have been carried out of one of the most unusual motor yachts ever built. Project SF99 was designed by French designer Philippe Starck and, with its axe bow and small superstructure, bears a marked similarity to advanced stealth warships.

The futuristic yacht, originally known as Project Sigma, is 118m long and was built in Kiel at the HDW shipyard, part of ThyssenKrupp Marine Systems. Although the identity of the yacht’s owner has not been revealed, there has been speculation that it may be a Russian businessman, possibly Andrei Melnichenko or Chelsea FC owner Roman Abramovich.