Devil’s Hole is a hot water-filled limestone cavern in the small corner of Nevada’s section of Death Valley National Park. It’s studied for a number of reasons, perhaps the most important of which is the Devil’s Hole pupfish, an endangered species known only to reside in the pit’s warm waters.

Last month, researchers were on hand to experience, and film, an extremely rare and fascinating occurrence: an earthquake in southern Mexico creating a mini-tsunami in Devil’s Hole. Metrics have even registered ripples on Devil’s Hole’s surface shortly after earthquakes last year in Japan and China.

One can only wonder just how deep and far-reaching the labyrinth’s network stretches. According to the Las Vegas Review Journal, in 1965, three divers went in to explore it and only two resurfaced. Their bodies were never found. Furthermore, it demonstrates just how physically connected our earth really is.