Sewer Worker Followed An Old Drain – And Found Something That He Wasn’t Supposed To See At The End

11. Thick Walls And More

What is really astonishing is that the walls are 8 feet thick, they’re bombproof and regularly patrolled. This is why during WWII raids, bank’s workers would find shelter in the vaults. Now you realize that we’re talking about really high standards of security. See how all of this is connected to what the worker in 1836 found!