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[–]Zapped 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

Can you explain how p-traps would keep water and gas from infiltrating the tunnels? I am having a hard time figuring that out. I understand about the gas being blocked, but then the tunnels couldn't breathe and those inside would suffocate.

[–]Canbot 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Multiple exits. Enough air to breath while you dig out.