We ventured deep inside a river cave and found a mysterious blue hole. Could it lead to an underground spring, or something ...

Enormous crater appeared suddenly in part of Russia, Yamal, where name translates as 'the end of the world' Some thought the rare and unusual structure, which was up to 300ft (70 metres ...

Coastguards have warned beachgoers not to enter a "very deep hole" that has appeared on the coast. The 12ft-deep (3.7m) formation was discovered near the Cliff Road car park in Felixstowe ...

With the walls of the hole – around 15m deep, according to NHK – eroding, rescue workers are unable to stay inside it for long. The hole was initially around 5m in diameter, but combined with ...