This one was on HN earlier this year: https://www.youtube.com/watch?v=6AV2NcyX7p... | Hacker News

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mitthrowaway2 8 months ago | parent | context | favorite | on: Heavy Construction of a Sewage Pump Station – Ep 3...

This one was on HN earlier this year: https://www.youtube.com/watch?v=6AV2NcyX7pk

(Construction of a pumped-energy-storage tunnel in Switzerland).

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