20 Things That Would Happen if Humans Disappeared From Earth Overnight
| September 14, 2016
Subways and streets will flood
Underground tunnels and subway systems will likely begin to flood in just a matter of days. Many subterranean tunnels sit below water table levels and require pumps to keep groundwater out. With no electricity and no one around to operate the pumps, underground tunnels will soon begin to fill with water. The flooding will eventually find its way to the streets, turning many well-known avenues into temporary rivers.
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