The waters that flow in have created an extensive cave system which rises at Brants Gill head.

In 2004 the body of Lamduan Armitage, dubbed by the media the "Lady of the Hills", was found near to the entrance of Sell Gill Hole.

[9] The distinctive rakes that adorn the hillside (particularly on the western edge of Pen-y-Ghent) were revealed during a great storm in July 1881.

In extreme flood conditions the entire chasm can fill it to the brim, and overflow onto the hillside.

The lower pitches of the cave are described as "some of the most flood prone in the Dales and can only be descended in very low water levels.

[13] An 18th century a guide-book named it "Hulpit", 'and was described as "like the inside of an enormous old Gothic castle, the high ruinous walls of which were left standing after the roof was fallen in".