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Could be of note that Stockholm is building the world's second-deepest subway station right now[1]. Though there's no real alternative to that because it needs to go under water (well, in the ground under water) towards the next station.

[1]: https://www.youtube.com/watch?v=TEYvywnJy78 (Swedish)

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When there isn't really a choice, fine build a deep station. Montreal is building a station 72m down, but it's driven by surrounding geography. What's a bad decision is deep tunnelling just because, like Toronto on the York subway extension. Deep bore under suburbia is really wasteful spending and that same transit budget could be building a lot more transit.

https://en.wikipedia.org/wiki/Édouard-Montpetit_station#REM_...

I lost 25 lbs in 6 months running down and walking up the looooong escalators in Stockholm because it took way, way too long to stand and ride.

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