Point Nemo has become the final resting place for hundreds of spacecraft. What will future archaeologists make of it?

In the middle of the South Pacific, around 2,688km (1,670 miles) from the nearest dry land, is a frigid patch of anonymous ocean – a deadly place of giant, ever-shifting swells, dramatic skies and storm-force winds. "The Southern Ocean is many shades of grey and can have huge waves… it's exciting and a little scary," says Dee Caffari, a record-breaking British sailor and one of few people on the planet to visit this remote place.