This location took a couple of trips - we found an entry point the first time but lacked rope, so a week later, sadly with less fog coverage, we descended into this place. By the dates on the blackboard, this hasn't been accessed much in the last few years since the walk-in entry was closed.
I believe this place was used as a communications hub during the cold war.
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I shot a lot of these handheld as I only had a mini-tripod with me. Apologies for the grain.