Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, between the Canadian province of Ontario and the US state of New York. An immense body of water, you may think its power could not be stopped, however in the summer of 1969 a group of engineers set out to just that.
They first discovered how to stop the flow of water and then tried to do it in practice. But nothing could have had them prepared them for what lay beneath. Read on to find out how these scientists achieved such a massive feat and what they discovered.