Isaiah 51:10

the great deep (Genesis 7:11; Amos 7:4; Psalms 36:6) is the primeval ocean of Genesis 1:2, out of which the dry land appeared. The Hebrew (těhôm) is connected etymologically with Tiâmat, the name of the Chaos-monster in the Babylonian creation tablets.

a way for the ransomed to pass over The reference to the Exodus is here unmistakeable. The transition is explained by the fact that every exhibition of Jehovah's power over the sea was regarded as a repetition on a smaller scale of the original miracle of creation. Both alike are illustrations of what the "arm of the Lord" can do, and of the great miracle of redemption to which the prophet looks forward.