The Waters Above

The firmament, third heaven, originally had a portion of the deep covering its outer surface. At the time of Noah's flood the windows of heaven opened and the water poured through and flooded the Earth.

Hell is Below, Heaven is Above

Diagram showing how gravitational time dilation can account for observed redshift

Hell is down, deep and below; heaven is up, high and above. There are many examples in scripture which are consistent with this orientation. Hell is never referred to as above, heaven is never referred to as below.

Above and Below

Cutaway of planet Earth showing the crust, mantle, great gulf and hell.

A recurring theme in scripture is heaven above and Earth below. Orientation occurs for the first time on the second day. It's an ordering of the universe which occurred in response to the creation of gravity.