While many people will chastise this dive, I happen to find it one of the best sites to improve your skills. I am newly cavern certified and found this to be the best no overhead area to dive. The visibility immediately diminishes at 30 feet as well as the temperature. We hit a thermocline around thirty and got out of it (after going through a hydrogen sulfide layer) around 80' and then the temperature climbed back up to around 72. At 30' there is a line running around the entire circumference of the sink and it is well worth the trip around; especially all the articles that have been placed in the wall niches as well as several solution tubes. With a light the vis pretty good. There are four platforms to practice on with the deepest being 100'. There are some lines running off the 100' platform to various areas but I would not recommend diving these without at least cavern certification. I found it a little intimidating at first but quickly adapted to the area. There is supposedly a sunken boat and bus but it was too dark to tell. The bottom is covered with thick black silt so keep your buoyancy under control. The dive shop (SCUBA West) is right across the street from the sink and has everything you need for your dive. They serviced our tanks with 32% and the shop personnel were knowledgeable and helpful. So if you are looking for a typical Florida spring dive this is not for you. But if you are looking to improve your skills and trying something different then I would highly recommend this sink.