it took me about 60hrs all in all m8 thats everything diggin the hole an building the room the hole was 8ft deep 9ft long an 8ft wide by hand too lol then i built a box that was 6.5ft high 7ft long and 6.5ft wide once id built the box it got completely coverd in gastight membrane (nothing gets through this shit) once coverd i put some blocks in the bottom of the hole so there was a 8in void once i lowerd my box it was completely coverd with concrete an steel mesh reinforcing
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