About 330 feet below the surface, a spherical shell of concrete rested on the floor of Lake Constance in Bodensee, Germany. Nearly 10 feet in diameter, the sphere was full of fresh lake water.

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† State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), China, 430074 ‡ Faculty of Earth Sciences, China University of Geosciences (Wuhan), China, ...