He went in slowly because the stairs were not in a good condition to be used properly. This pit seemed like a tunnel. Or call it terror tunnel. He felt discomfort the moment he stepped in. Yes there is a possibility that this discomfort was caused because there was no proper air flow as it was shut for years. It was sure that this place needed lot of work and in order to unravel the mystery of this tunnel, John will have to make this work.