Hacker News Reader

I recently went swimming in one of these submerged mines/quarries in North America. This one flooded during a severe hurricane: https://en.wikipedia.org/wiki/Portland_Brownstone_Quarries

View on HN

The Minnesota Iron Range is full of these and they're absolutely beautiful; terrifyingly deep, however.

[1] https://www.youtube.com/watch?v=LAL_d-5FsGQ - Tioga Pit Mine (225' deep)

[2] https://en.wikipedia.org/wiki/Portsmouth_Mine_Pit_Lake (450' deep)

Stumbled across this one later in my recommended videos that I like even better: https://www.youtube.com/watch?v=NC267JdGN24

Hah! Not every day my neighborhood gets a shout out on HN. I’ve swam in that pit in the video. Neck deep you can see your toes. Found a couple pipe bombs… definitely gets a lot of attention from bored people.

Well, we have 2026 now. And since 263 years the SI (system international) units are a thing. Everything else is outdated and gross, since it only complicates calculations. It's about time switch to modern times.

That said, the Lake of Constance (shared by Switzerland, Germany and a bit of Austria) is at the deepest location 251 m deep. There is however nothing terrifying about that. And it's about twice as deep as your Portsmouth Mine.

Reply on news.ycombinator.com