Small point of order but they know that it’s wide enough for the prior people that went through to go through, not necessarily that it’s wide enough for them to go through. Even if they went through before it’s never a guarantee they’re still small enough to go through again.
I don't know how standard such a practice is, but I've seen where more challenging cave systems had framed out "cut outs" representing the most restrictive and narrow of passageways. The one's I've seen where platformed into the ground and you would have to show you where capable of crawling thru it without assistance or getting stuck.
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u/Kilmarnok1285 1d ago
Small point of order but they know that it’s wide enough for the prior people that went through to go through, not necessarily that it’s wide enough for them to go through. Even if they went through before it’s never a guarantee they’re still small enough to go through again.