The famed Texas destination known as Jacob's Well boasts crystal-clear water that may be both refreshing and dangerous.

Jacob's Well, a spring that overflows a sizable underwater cave, is popular with divers and underwater explorers.

The water may look inviting with its clear color, but it is actually quite dangerous, so the faint of heart should avoid taking a dip in this well.

Jacob's Well in Texas: Perennial Karstic Spring

Around 1850, it is thought that settlers happened upon Jacob's Well. The watering hole, which is actually a perennial karstic spring, has a diameter of 12 feet and was spitting its thirst-quenching waters as much as five feet high when it was discovered. Of course, the settlers did not dive into it; instead, they used it as a drinking fountain and eventually as a source of power for a sawmill. They gave it the biblical splendor and called it Jacob's Well.

There have been at least 4,500 feet of the well-investigated since it was founded. It is currently believed to be Texas' second-largest entirely submerged cave. It is 120 feet deep on average and is situated on 80 acres of protected land.

Crystal Clear Water

The Trinity Aquifer, which essentially covers the whole southwestern corner of the state, is where the water in Jacob's Well is sourced. The well can no longer spew 170 gallons of water per second because to nearby development. Today, all that remains of the "fountain" is a surface ripple with water coming in from Cypress Creek.

In the Hill Country, Jacob's Well's chilly water is a key draw. Daredevils leap from a nearby ledge into the well's confined hole. Free divers explore the aperture, occasionally descending up to 100 feet, and making their way through the underwater cave's tunnels.

Although recreational scuba diving is prohibited, even scuba divers occasionally venture into what the Jacob's Well Exploration Project describes as a challenging and unforgiving environment.

Some people might consider relaxing on the well's lip, seeking refuge from the heat, or hanging out with pals to be serious fun, but for others, these activities are a way of life.

Dangerous Tankless Dives and Trechourous Underwater Caves

Jacob's Well is frequently referred to as one of the most dangerous diving locations in the world because, according to The Houston Chronicle, twelve divers have perished there while scuba diving. Two teenage Texans drowned in one of the well's caves in 1979 after being trapped there. One of the bodies was taken out of the well in 1981, but the other wasn't discovered there until a search for it was made in 2000.

Because the tunnels in Jacob's Well get so small, divers must take their tanks off, which is a challenging situation. Diego Adame, who was 21 in July 2015, lost a flipper while free-diving the tunnels deep in the well in July 2015 and needed to cut away his weight belt to get back to the surface before his breath ran out, describing it as a life-threatening event. There is also the sheer depth of the cave.

Jacob's Well can be perilous even from above. Despite having a diameter of only 12 feet and being surrounded by rock, many people jump in head-first or do flips in the upward tide. Swimming is permitted, but only at the swimmer's own risk and only when the rules are observed, Treehugger reports.