User blog comment:Shadow Wolf TJC/Apparently, you can still flood hell (sort of)./@comment-4231978-20110807233951/@comment-3226495-20110808092623

It evaporates, I'm not sure what causes this, but I've seen water like this before and like Shadow wolf says, it only works for as long as the water remains undisturbed. So you can't "Flood" hell, but you can make water drop down to form a obsidian layer over 1-2 lava lakes.