Burrowing creatures are good at plumbing or they would drown. It is the same way your sink or toilet pipes work, except we want to keep nasty stuff from coming up and they want to keep water out.
It’s capped a P-trap because the pipe resembles the letter P sideways and that bend traps water and gas. It would take a significant amount of pressure to pass, and then it traps up again, like flushing a toilet.
You can see diagrams of ant burrows and beaver’s nests online.
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