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The R&D Tunnel, also called the Hawthorne Test Tunnel or Boring Test Tunnel, is a 1.14 miles (1.83 km) tunnel in Hawthorne, California, for testing hyperloop and "loop-based transportation".[3] It was completed by The Boring Company in late 2018. The single-bore tunnel was constructed during 2017 and 2018 using a 14-foot (4.2 m) diameter tunnel boring machine, giving a finished 12-foot (3.8 m) internal diameter.
^Lopatto, Elizabeth (December 19, 2018). "I took a ride through Elon Musk's new tunnel in California". Archived from the original on December 20, 2018. Retrieved December 19, 2018. top speed is 40 miles per hour … 1.14 mile tunnel … one-mile test tunnel … year and a half to complete, … about $10 million, not counting research and development
^Hawkins, Andrew (May 24, 2019). "Elon Musk's Boring Company staged a race between a Tesla in a tunnel and one on the road". Archived from the original on June 11, 2019. Retrieved June 15, 2019. the Tesla in the tunnel hit a maximum speed of 127 mph
^"The Boring Company Projects page: 2020". The Boring Company. November 11, 2020. Archived from the original on November 11, 2020. Retrieved November 11, 2020.
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