0:58 - 1:09 makes a priceless cut…
I could be mistaken, but to me it looks like that "fireplace" is the entrance to the 'expansion'.. everything in the interior is finished and has been for some time, but they've recently excavated further thru that hole, hence the mess in this room
could be smoke residue or water residue.. looks like the only source for all the dirt in this otherwise finished room.
dude runs away with a soiled mattress, there's mixed reporting on who was doing what with regards to uncovering/sealing the tunnel.. honestly seems like cops were trying to secure it, other guys were trying to run off with any remaining evidence… end all question is who brought the cement, I doubt the cops brought the cement.