[jimmyray]

I agree, in that something made them live longer, and it was, in my limited understanding, some sort of water canopy above the Earth, which would filter harmful radiation. At the time of the flood, it collapsed, and along with the fountains of the deep, flooded the entire Earth.

[DevNet]

That water canopy would also filter out a considerable portion of visible light and infrared rendering the Earth a giant froze sphere.

[Lexinom]

Here. The article states the theory has been "largely discredited" but fails to support that charge. The crystalline canopy theory is logical and consistent with Scripture e.g. long life, lack of mention of clouds/weather prior to the flood, very large creatures, and finally the flood itself.