The incident happened at about 13:00 BST at Sinc Galed quarry hole, known to climbers as California. The team is urging inexperienced people to avoid exploring quarries. Posting to Facebook ...

Two centuries of slate extraction left a mountain-sized hole and a pock-marked monument to human endeavour. Dinorwig Quarry ...

Screengrab from Cotwold Archaeology's Facebook post In a quarry in eastern England ... The second well was lined with wooden boards to prevent the hole from caving in. The Romans occupied England ...