Devils Hole.
On the surface, it is just a 10-foot-wide, 25-foot-long pool in the middle of Death Valley National Park.
However, below the surface, it expands into a 500-foot, life saving pool.
Life saving?
If you're one of 136 pupfish that call Devils Hole home.
The rarest fish on the planet used the deeper, 500-foot pool for safety when their one-inch bodies were threatened by the 7.1 magnitude earthquake that struck on July 5.
The shaking caused 10-foot waves to roll through Devils Hole, but thanks to fine-tuned instincts, the endangered fish had a five-second warning, and they used that time to dive deep into the geothermal pool before the massive waves ravaged Devils Hole.
Unfortunately, according to Los Angeles Times, their eggs and larvae were destroyed by the waves.