Hawthorne test tunnel

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The Hawthorne test tunnel, or Boring test tunnel, is a 1.14 miles (1.83 km) tunnel in Hawthorne, California, intended for testing “tunneling and public transportation systems”, constructed between 2016 and 2018. It was accompanied by a mile-long aboveground tube on nearby Jack Northrop Ave designed for testing hyperloop and loop-based transportation, which was used for student competitions in 2018 and 2019 before being dismantled in 2022.

Read on Wikipedia · Image Steve Jurvetson from Los Altos, USA, CC BY 2.0