I was chatting with a very sweet and kind friend today. She owes me some chocolates and cakes but that is not relevant here. She seemed surprised that I work underground. I was visiting another department today. They have a staircase to the surface from there. I am two floors below this point. A floor is twice the size of a storey here. So about 12 metres under ground from this point. There are two floors below that. One is unused, as its a methane trap

Those ladders you can see are about 2m tall. Its a long way to the surface