If you aren't familiar with Jacob's Well it is one of those little geographical anomalies that exist as trivia tidbits for small towns. It is basically an underwater cave in Central Texas that is insanely deep. I remember visiting there as a kid and people saying it was deep and that several scuba divers had died trying to explore it. I had completely forgotten about it until I came across this scuba video:
And that is just the part you can easily get to without special equipment!
Here is the description of the video for those interested:
Jacob's Well is considered a dangerous underwater cave for novice or non-cave trained SCUBA divers with at least eight divers having died in the system. At the present,
four chambers have been explored, the last of which ends in a too narrow
restriction for divers to continue. To date, 8 divers have perished exploring the well.
Read more at http://www.liveleak.com/view?i=03c_1386702528#5fPRSOfRz7vcQbH4.99