Mattock probed the stones in front of him using a long pole with a steel cap. He’d put it there after almost losing his leg to a trap triggered by the metal he was carrying. Once his examination of the floor was complete, he placed the pole on the ground behind him and adjusted his lantern. The next set of tools clinked on their ring as he removed them from his backpack. Mattock assessed each in turn before selecting one and using it to examine the tunnel wall. Once he’d finished with it, the final inspection was with his fingers.