Sorry I was mistaken. So your well was 18 ins deep when you met the roof of the cave which was 6 ins thick, and under that is the open space of the cave itself?

I saw a different well dug and thought it was yours.

The well I saw being dug for concrete water to build the building was dug down through less than two ft of sand, but they didn't find water so they busted the laha and found the usual layer of foul smelling mud, then a layer of compressed material like peat. They never could dig through the peat and the muck to clean water.
That one was a normal well with the laha broken like the dozens I dug elsewhere. In every other well on CC is like that, with layers of muck,sand and laha like a layer cake, repeating as you dig.

I guess your main well is unique in the fact that it accesses the roof of the cave right under the surface. Quite interesting to someone like me who has studied so many wells and the water supply on the Caye. Thanks for the update.