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Cavity Structural Effect. The Cavity Structural Effect (CSE) was discovered in spring 1983 by chance by Viktor S. Grebennikov (1927-2001), entomologist and painter, when he moved his hand over multi cavernous bee nests and felt warmth emanating from them.
How do cavern and cave diving. Cavern diving is the exploration of permanent, naturally occurring overhead environments while remaining within sight of their entrances. It differs from cave diving in that, while cave divers may penetrate thousands of yards, cavern divers generally go no further than 130 feet from the surface.