Geologists describe Florida as a state built on what amounts to floating Swiss cheese.
These metaphors, along with Bartram's descriptions and Coleridge's embellishments, speak of a foundation riddled with interconnected voids. The classic example of the boundless labyrinth beneath our feet is the story of the pouring of a concrete foundation for Shands Hospital, supposedly the largest building south of the Pentagon. During the construction of one portion of the hospital, holes were bored into the limestone substrate in order to cast a foundation of buried piers. Before reaching the required depth, the augur broke through the ceiling of an underground cave. It was decided to pump the cave full of concrete, then to fill the piers as planned.