I spent some time in Cuba in Sept 2015, but unfortunately was unable to visit any caves. However I did see my first cenote.
Cenotes are sinkholes that contain groundwater and usually connect to underground water bodies. The name is commonly used in the Mexico and Caribbean areas.
La Cueva de los Peces is on the southern coast of central Cuba, at the Bay of Pigs.
It is 17 km south of Playa Larga, in Matanzas province, La Cueva de los Peces is a 61-meter-deep sinkhole. There are lots of fish.
Interesting 'fossils' in the floor -
This is the coast where the cenote water presumably comes out -
The sea is crystal clear