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Check room quality at the beginning of the entrance.

Knee-pads (and sometimes elbow-pads) are popular in some applications for the protection of joints during crawls or hits. Wikipedia]

Boots or other sturdy footwear with good grips may be worn, especially climbing shoes. [Wikipedia]

Gloves protect hands from the rope and from hits with the wall. They are mainly used by recreational abseilers, industrial access practitioners, adventure racers and military as opposed to climbers or mountaineers. In fact, they can increase the risk of accident by becoming caught in the descender in certain situations. [Wikipedia]

Helmets may be worn to protect the head from bumps and falling rocks. A light source may be mounted on the helmet in order to keep the hands free in unlit areas. [Wikipedia]