15 Ocean Facts So Strange They Sound Made Up

Humans have explored only a small fraction of the ocean — less of the seafloor is mapped in detail than Mars.

The deepest fish ever filmed was 8,336 m down in a trench near Japan in 2023.

Over 75% of deep-sea animals make their own light through bioluminescence.

The ocean's mid-ocean ridge is Earth's longest mountain range at nearly 65,000 km.

Phytoplankton in the sea make roughly half the oxygen we breathe.