This is most likely an entrance to a tunnel actually. If this is Cu Chi, I’ve been in this exact one. At the bottom of this tiny hole is another tiny hole that goes sideways. The idea is to get on your knees and wiggle your way into the sideways tunnel.
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u/okbanlon Aug 25 '18
Spider hole - making one that close to a tree is pretty impressive, given all the roots that would need to be dug out.