THE largest cavern in Britain opened up to the public at the weekend.

Gaping Gill in the Yorkshire Dales National Park is only open two weekends a year, allowing people to be winched from a hole in the roof and up again for a fee of £15.

The drop is 110 metres, the same height as St Paul’s Cathedral. Fell Beck stream, which created the cavern, creates Britain’s highest unbroken waterfall.