There are 2 elevators, the second elevator is either sand or water. and does not go to the bottom. Water is filtered in the shallow above pond, that freshens the below lake and garden,... the pond powers-in a pressure flow for energy. The garden supplies food and the above pond could be clear, so as to view the weather. thru the bottom lens, the pond and then the top lens.. those confines hold filtered air and water within its lens bubble.../ The outlet of the lake from overflow exits w/the incoming elevator visits[]. (if stairs out exist.) and exits when the character climbs the mangrove wall area for exercise. each foot press while climbing air compressor pushes excess water out of the bottom of the cave,... When the other character climbs into the tree, a rising stair stepper is used, and he can raise the overloaded sand from the elevator trips into the cave.../ If the cave moves along the ocean floor, and leaves the shoreline, one way is from, a sealed scoop of water in a track action underneath the cave, releasing the water out the back. *Other energy sources, not the surface-only turbine, but a small upright water/air wheel, that fills at the ocean surface, that heavies each water tank and then rises w/air bubbles from the cave. extra cave air is from a surface to cave tube. Sand-timer elevator info is on its own page.
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