Freeze Wall

Oil firm, Shell has constructed a monumental underground wall of ice stretching across several oil shale deposts in Colorado, Utah, and Wyoming. In order to reach what could be up to 800 billion barrels of oil (3x the size of Saudi Arabia’s reserves ) stuck in subterranean layers of shale, flattened under the soil of the central Rocky Mountains. Shell needs to freeze the surrounding earth in place to keep groundwater from infiltrating wells, and to prevent produced oil from contaminating nearby groundwater.

Denver Post

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