theres a tourist attraction in eger hungary called "city under the city" or "város a város alatt", its an underground system of tunnels under the basilica that tour guides say used to be wine cellars but if you do any amount of research on it online youll find that it was actually dug out by the nazis during their brief occupation of the country because they believed there is some powerful esoteric shit there, like fucking cthulhu or some shit, couldnt find any exact details besides all this but damn this explains why theres so many tunnels that are walled off there

>>40722953 (OP)
Get a crew together and go bust down some walls

>>40723042
Or maybe there's an opening where you could get a drone or some RC vehicle through