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 narrowrestriction for divers to contihttp://en.wikipedia.org/wiki/Jacob%27s_Well_%28Texas%29#cite_note-8nue. To date, 8 divers have perished exploring the well.