World’s Largest Drain Hole.

I disagree. It doesn’t exist now, but Lake Peigneur at one time had the biggest drain hole.

http://earthdude1.tripod.com/texaco/texaco.html

They call it a “glory hole”

I actually think this glory hole in Northern California is bigger. You can compare it to the roadway and it seems larger. I’m not sure how often it actually drains though. http://virtualguidebooks.com/NorthCalif/NorthCoastRanges/Whiskeytown/G loryHoleWhiskeytown_FS.html

I wonder if you fell into that thing while it was draining if you’d survive. There aren’t any turbines to chop you up or grates to Play-Dough Fun Factory you to death. You’d just need to hold your breath and maybe wear a helmet. Not that I’m going to volunteer to take the plunge, mind you.

It needs “goatse” hands…

I’ve stood next to the one at Harriman Dam in Vermont. It was very scarry. I can imagine how a spider feels getting washed down the tub drain.

It just drains out the other side of the dam. Follow the link and you’ll see people using the horizontal part as a skate board park during the dry season.

Now that I think of it, my neighbor’s man made swimming pond operates on a similar, albeit many times smaller, principle.