In most cases a 10' pole would be something that wouldn't be plausible to have because it's too large, so would fail the "plausible to have brought" test, so couldn't be obtained that way.
That obviates most of the rest of your concerns I note ("twisty passages" etc.). Whereas if they wanted a one-handed hammer, or a crowbar/prybar, something similar that could have been in a backpack, sure.
That said, I've never seen a D&D situation where a 10' pole was actually particularly useful (or at least - more useful than a shorter but equally wooden stick or pole or club), and I've been playing for 34 years.