Why are there giant concrete tunnels in the desert?

The Physics Girl team visited LIGO once again. This place is Dianna's obsession. If you liked this video check out these: I Visited the First Gravitational Wave Detector! LIGO | STELLAR https://www.youtube.com/watch?v=jtp71NT0GNg& Why aren't plants black? :herb: https://www.youtube.com/watch?v=3BRP4wcSCM0& Thanks to LIGO Hanford, Michael Landry, Amber Strunk, Sharan Banagiri and Salvatore Vitale. http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Creator/Host: Dianna Cowern Editor: Levi Butner Research & Writing: Dianna & Imogen Ashford