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.
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Видео Why are there giant concrete tunnels in the desert? канала Physics Girl