The ocean is, on average, 3,682 meters deep — the deepest point is about 11,000 meters.

NOAA's exploration of deep ocean vents has discovered ecosystems entirely dependent on chemosynthesis rather than sunlight.

Sea turtles have existed for over 100 million years.

Some species of nudibranch (sea slug) incorporate stinging cells from jellyfish into their own bodies for defense.

Some fish can walk on land.

Hydrothermal vents support unique ecosystems without sunlight.

The highest recorded ocean wave exceeded 80 feet in height.

The deep ocean floor is covered with fine sediment known as ooze.

Deep-sea fish like the barreleye have transparent heads and tubular eyes that can rotate to face upward.