One Day Work
Sonotube cardboard was used near the entrance to ensure the structure does not fall. It helped in protecting the interiors of the stairways. As this staircase was old and rusty, it had potential to fall off and if that happened, they will have to start working all over again. They are all made sure that they are not destroying any originality of the structure while trying to make it safe as they wanted to know and explore every original detail of the tunnel.