You might enjoy this (now 2 part series) - https://www.youtube.com/watch?v=M2oELc61XHE

I took this[0] in Kyiv, it was really uncomfortable. Apparently it's "Deepest Metro station in the world, and a long escalator ride" [1]

[0]: https://dynamic-media-cdn.tripadvisor.com/media/photo-o/15/9...

[1]: https://www.tripadvisor.com/Attraction_Review-g294474-d80742...

I'm going to guess the person suffers from vertigo, as have I to a small degree - particularly on the metro escalator in Rosslyn, VA (across the river from DC). The sensation occurs going down or up very tall escalators in a tunnel. When it hits, you feel like you are traveling horizontally with some weird tunnel vision. This is terrifying and can cause you to feel like you're falling - even when you know you are going down or up, your eyes are telling you you're traveling horizontally.

I've also gotten this driving a car through long tunnels as well, going down or up (Baltimore 895 harbor tunnel can do this).

I’m pretty scared of heights and generally haven’t been triggered by any long escalators into subways, but there’s one on the DC Metro (Adams Morgan maybe?) that kind of freaked me out.

I'd guess that a long narrow escalator could make someone feel "trapped", in a way that regular stairs generally wouldn't.

Yes, really. Avoided if at all avoidable-really. Regular length is terrifying and more than that is no-go territory.