They didn't know.<quoted text>"Hot springs on the ocean floor are called hydrothermal vents."
Still waiting for answer on how the Hebrews knew about these springs in the deep before it was discovered in 1977. And the song, "there's a hole in the bottom of the sea" isn't an answer (@ Ben, wink wink)
You are projecting your contemporary knowledge on them. You obviously don't know what they meant when they wrote that passage in Ancient Hebrew and not English, and you even more clearly don't care.
Because the only thing that matters to you is supporting your religion, no matter how intellectually dishonest you have to be.