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.
The Waters Above
Tehom
We (that's me and the Holy spirit) make a contextual connection between tehom and sheol because they're both used to refer to the underworld realm of the dead, also known as the grave.
Create, purge: בֹּרִית – barar
Purging ties in with the broad narrative of scripture of refining and purification, the agent of which is the Lord Jesus Christ. Here's the meaning of the Hebrew root from which their word for soap is derived.
How Deep was Noah’s Flood?
There was enough water in the great deep to flood the Earth 1,200 km deep. 15 cubits was when the crew of the ark stopped taking soundings. Mount Everest formed 101 years AFTER Noah's flood during Peleg's tectonics.
The Volume of the Great Deep
When Noah's flood took place all of the waters of the great deep burst forth and flooded the Earth. If we know the volume of water and the radius of the Earth at this time, then we may calculate how deep the water was.
The Deep
The deep existed in the beginning, before God began to create. This means that creation isn't ex nihilo, from nothing, it's ex abyssi, from the deep. This is so obvious that everyone has missed it completely.
It Devoured the Great Deep
Thus hath the Lord GOD shewed unto me: and, behold, the Lord GOD called to contend by fire, and it devoured the great deep, and did eat up a part. (Amos 7:4) KJV
Hydroxyl (OH)
If you thought that we had gone off the deep end before, then you should know that the deep end also has a deep end. We're combining the gospel of salvation through faith in Jesus Christ with Chemistry and Physics.
Lye: בַּנֶּ֔תֶר – Nitre, nether
We've frequently heard it said that the Bible isn't a science book. Many of the people who say this are Christians. We disagree, but we can understand why people, even Christians, would say this.
Soap: וּכְבֹרִ֖ית – borith
The coming judgment of God is described as like being washed with strong soap. The word translated "soap" has a direct application in Chemistry. Are we surprised? No, God really is a chemist.