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You can. but you should not leave an in ground pool empty for any period of time. Ground water building up around it is capable of even lifting an empty concrete pool out of the ground.
Florida is prone to sinkholes because of the amount of water that is in the ground. The water under the ground moves to a different location, which in turn leaves an empty space.
If you mean can a concrete pool pop up out of the ground then the answer is Yes it can. All you need is an empty or partially empty concrete pool and a lot of ground water around it once the ground water around the outside of the pool builds up enough the pool will start to float. I have seen it happen several times over the years. To avoid this happening most pools have a hydrostatic valve fitted in the bottom of the pool to allow ground water into the pool when there is a build up of water pressure outside the pool it flows into the pool to stop it from floating.
Honeycombs in concrete are empty spaces that decrease the structural integrity of the concrete. These can be eliminated by rolling the concrete tight after pouring it.
Florida
a few empty planes on the ground a few empty planes on the ground
The abstract noun for the adjective empty and the verb to empty is emptiness.The word empty and the plural empties are used informally as nouns for containers that no longer have contents, concrete nouns.
There is no weight in an empty balloon. Empty balloons will not stay on the ground long enough to have any real weight.
I've heard that it's not a good Idea. If the ground water level is high it forces the pool to rise out of the ground like a boat on top of water. Unlike concrete that is heavy. Fiberglass can float. It may not come out of the ground all the way. I suggest that you speak with a pool company and ask their advise.
Throw a submersible pump into the pool put the hose from it into a suitable drain and start her up. Take care that you don't have too much ground water as this could build up under an empty pool and lift it out of the ground and that would wreck it. even concrete pools.
If you are signing in an (otherwise) empty room the sound will echo around you and will possibly sound high-pitched. If you are signing in an empty room then the room isn't empty.
ground clearance?