Genesis 7:18 - Refuge in God's Hands

And the waters prevailed, and were increased greatly upon the earth; and the ark went upon the face of the waters.

The ark was the hand of God providing refuge for Noah and his family. The forth edition of the Thompson New Chain-Reference Bible has marked Psalms 104:26 as the parallel passage for this verse.

There go the ships: there is that leviathan, whom thou hast made to play therein.

So, therefore Noah and his family were not only protected from drowning, they also were protected from the horrors that lurked from below, such as leviathan. "Leviathan is often considered to be a demon or natural monster associated with Satan or the Devil, and held by some to be the same monster as Rahab" (Wikipedia.com).