STEPPING OR KNEELING ON OBJECT at Newtown Energy, Inc.
The EE stated that while dismounting the rear of the 404 roof bolter, he stepped into a small hole of water that contained a hidden piece of rock. While dismounting, he stepped onto the rock with his right foot. The rock was slicken sided which caused his foot to slip off the rock twisting his ankle.
U.S. Mine Safety and Health Administration