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Under earth. Bugs and microorganisms ; An anthill ; Burrowing animals ; Edible roots and more ; Deep roots ; Underground utilities ; Natural gas ; Electricity ; Water ; Sewage ; Tunnels ; Subways ; Archaeological finds ; Paleontological finds ; Dreadnought ; Caves ; Krubera cave ; A mine ; Mponeng ; Mined resources ; Kola super-deep borehole ; Tectonic plates ; How volcanoes form ; How geysers form ; Earth's layers ; The core
Under water. Lakes ; The ocean ; Bouyancy ; Coral reefs ; Sinkholes ; Under pressure ; Diving ; Record-breaking divers ; A history of diving suits ; A history of submarines ; A silent traveler ; Giants of the deep ; Oil and gas platforms ; Scientists underwater ; The Titanic ; Underwater chimneys ; Deep dwellers ; Anglerfish and lantern fish ; The Mariana Trench ; Deepsea Challenger.
Under water. Lakes ; The ocean ; Bouyancy ; Coral reefs ; Sinkholes ; Under pressure ; Diving ; Record-breaking divers ; A history of diving suits ; A history of submarines ; A silent traveler ; Giants of the deep ; Oil and gas platforms ; Scientists underwater ; The Titanic ; Underwater chimneys ; Deep dwellers ; Anglerfish and lantern fish ; The Mariana Trench ; Deepsea Challenger.