The answer is: Fish

Gen 7:21 - All that moved upon the land perished, but each land animal was preserved in the ark. There is no mention of the water living creatures so they must have been able to survive the flood waters.

When you think about Noah’s Ark, it's often all about those cute pairs of animals strolling up the gangplank (such as elephants or lions). But let's take a second to note the nifty David and Goliath situation happening in the waters below: the fish! It's fascinating to realize that aquatic life wasn’t included in the headcount for the Ark, and really, could they possibly have floundered under Noah's consideration?

In Genesis 7:21, we're told that all land animals perished, while fish were swimming along merrily. This leads to intriguing discussions about preservation in biblical narratives. It's like nature's own version of an underwater sanctuary—besides, they've survived far worse over the eons. Think about the extinction events on Earth—through ice ages or even asteroids—yet fish still hold court deep beneath the waves.

This highlights the powerful themes of reliance on natural order. While Noah ushered land-dwellers into safety, aquatic creatures were the underdog victors of amazing adaptability. Additionally, this connection between creatures, land, and water draws us to the the often overlooked significance of water in biblical themes—like baptism symbolizing renewal.

So the next time you picture Noah’s Ark, remember there’s a whole world thriving beneath the surface! What a testament to survival and ingenuity in creation, don't you think?