Morrison's cave entrance was dynamited shut a few decades ago, it definately fits the description in that manner. Sock shape? I dunno about that, unless looking from above at the spring run, maybe? There are tons of springs reffered to as "Blue Springs", the closest one NW FL is Jackson Blue Spring in Merrits Mill Pond(Marianna), however, its cave system is wide open for people certified enough to explore it. There's also Madison Blue, Blue Spring on the Wacissa, Orange City Blue, and more; but they are further into FL.
Morrison is no more than 10miles South of Vortex as the crow flies. The basin funnels down and drops to a small cavern at 35' and then another very large cavern opening at 50' with depths to ~90'. You can see where the cave entrance used to be, there is still a small vent with alot of flow coming out. The blasting wire is still present and winds down underneath alot of sand/rock rubble from when it was blasted. There is another vent in the cavern that is supposedly possibly side mountable or more likely, no mountable. I've never seen anyone go in though. A hellovalotta flow coming out of either vent.
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Originally Posted by Dive-aholic
You're talking about Blue Spring in Orange City. It's about 45 minutes north of Orlando. Check out this link. I dove there last May and the water level was down about 15-20'. It made for a heck of an entry into the spring. The current was ripping.
As far as I know, without being there, the entrance to the cave system at Orange Cities Blue Spring has never been blown to prevent entry.
There are several "Blue Springs".