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If you're planning to do any diving there, wear a drysuit or a thick wetsuit with a hood. The water temperature is 63 degrees from the surface down to 80 feet. It warms up to 74 degrees as you approach the bottom. Visibility is 25 - 30 feet in the shallower depths, but is 10 feet or less on the bottom.
are any of the cars and boats still visible at the bottom or are all of them covered in silt now?
The vans and boats are still visible. The vans have been down for many years though, so they're falling apart. If you touch them with your bare hands, you'll get black stains on them. They were in a lot better shape and not buried so far down in the silt when I surveyed that sinkhole in 1994. The colorized map under the canopy is from my survey.