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Certiﬁed photos by travelers like you. What's this?
Nearing exit, this would have been a number of tunnels on top of each other that caved in, were reinforced and made into larger walkways. You can see by looking up how near we really are to the surface..
Our guide showed us this view to understand the construction of the tunnels which were made without plan in early stage. The haphazard construction put the workers and buildings above at risk to cave ins.