Located northwest of Wimberley, Texas, Jacob’s Well is the largest and one of the most dangerous underwater caves in Texas.
The well is a popular spot for locals and tourists, and is the main source of water recharging the Edwards Aquifer.
The opening of the mouth is about 13 feet wide and descends to about 30 feet deep. It then continues downward at a slight angle through narrow chambers, reaching depths of 120 feet deep.
Jacob’s Well was not always accessible, it use to flow at 170 US gallons per second and spewing water nearly 6 feet into the air.
What’s even more incredible is that the well has been mapped by cave divers, and one passageway is 4,300 feet from the surface while another one measures over 1,000 feet in length.
While the well is extremely popular it also can be deadly, since it’s extremely easy to get lost below the surface. Nine people have died since the well has been accessible.