It is the largest thing mankind has ever built, by far .. and if it blows out then it could kill and displace millions.
While they were building that dam...it was difficult to get concrete here in Charlotte because the CCCP would pay the plants more to truck the ingredients to Charleston and ship them in mega ships to China. They rationed concrete here and the price went up about 20%...and the plants still said they were losing money by selling to locals.
As much as I hate the Communist party ruling China, I would hate to see that dam collapse. The destruction downstream would be visible from space.