The Mariana Trench is the deepest spot in the world's oceans and only a handful of people have been there. But for the first time, travellers are being offered the opportunity to explore it - if they have a spare $100,000 to $200,000 (£83,000 to £166,000). Isle of Man-based Eyos Expeditions is offering three members of the public the chance to tag along on a dive it's organising to a spot in the Western Pacific trench known as Challenger Deep - 35,853ft (10,928 metres/6.79 miles) beneath the surface. It is, the company says, the most exclusive destination on the planet.