In Britain, at the Clay Cross Colliery near Chesterfield in Derbyshire, miners broke through into a disused and water-filled old tunnel and immediately their diggings were flooded. Many were able to make it to the surface but twenty-one men and boys and sixty-four pit ponies were trapped and drowned. (By John Osborne)
Source Citation
Chronicle, The Annual Register or a View of the History and Politics of the Year 1861 (London: F. & J. Rivington, 1862), p. 78.