Possible air vent entrance (4)
This is an unusual spot in the North along the creek and may suggest a hidden entrance to an air vent off the main tunnel system. Russ is checking for a difference in the air temperature coming out of the hole.
Possible air vent entrance (4)
This is an unusual spot in the North along the creek and may suggest a hidden entrance to an air vent off the main tunnel system. Russ is checking for a difference in the air temperature coming out of the hole.