Genesis 7:18

18 And the water prevailed and abounded exceedingly upon the earth, and the ark was borne upon the water.

Genesis 7:18 Meaning and Commentary

Genesis 7:18

And the waters prevailed, and were increased greatly upon
the earth
Still they became greater and more powerful, as to bear up the ark, so to cast down houses, trees by the continual rains that fell, though perhaps they were not so violent as before, and by the constant eruptions of water out of the earth: and the ark went upon the face of the waters;
it floated about upon them, in an easy gentle manner; for there were no storms of wind or tempests raised, which might endanger it. (If much of the water came from volcanic activity, and if earthquakes accompanied the breaking forth of the fountains of the deep, many tidal waves would result. This would completely destroy and remains of the old civilisation and as well give the ark a rough sea to drift in. The ark's dimensions would give make it almost impossible to upset. Ed.)

Genesis 7:18 In-Context

16 And they that entered went in male and female of all flesh, as God commanded Noe, and the Lord God shut the ark outside of him.
17 And the flood was upon the earth forty days and forty nights, and the water abounded greatly and bore up the ark, and it was lifted on high from off the earth.
18 And the water prevailed and abounded exceedingly upon the earth, and the ark was borne upon the water.
19 And the water prevailed exceedingly upon the earth, and covered all the high mountains which were under heaven.
20 Fifteen cubits upwards was the water raised, and it covered all the high mountains.

The Brenton translation of the Septuagint is in the public domain.