Horrifying Things Scientists Found When They Drained Niagara Falls

References:

https://www.snopes.com/fact-check/niagara-falls-drained/
https://www.finance101.com/niagara-falls-horrific-discovery/
https://newstimes18.com/horrifying-issues-scientists-discovered-when-they-drained-niagara-falls/
https://www.pastfactory.com/history/scientists-drained-niagara-falls/?view-all&chrome=1
https://www.obsev.com/life/chilling-discovery-under-niagara-falls/