Experts Drain Niagara Falls, Call Cops When They See The Bottom

Cofferdam

Reddit/WholeMalk

The first thing the engineers did was to bring roughly 27,000 tons of earth and rock to the falls. The reason for this was to build what’s known as a cofferdam.

A cofferdam is an enclosure that is used to pump out the water so that there is a dry area where they can work.

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