The carwash cenote is located outside of Tulum Mexico and is a now place that has a parking lot, a snorkle section, and a place, that allows diving.
This is a collapsed sinkhole that connects two caves and the system continues
into the depths of the Yucatan.
according to Agua Clara diving Tulum Cenote Carwash - The gate of cave diving (aguaclaradivingtulum.com)
The carwash cenote was one of the first cave dives in the region due to the taxi cab drivers coming here to clean their cars. The bottom two photos are not my photos.
I have hear that this cave was not as decorated as some of the other caves in the region so I opted to free dive into the cavern zones
instead of diving. I was able to get into the entrance and follow the gold line for a bit before returning to the surface.