The world's deepest postbox is in Susami Bay, Japan — it sits 10 meters underwater and receives waterproofed mail.

The Earth's tilt is responsible for seasonal climate patterns.

Fact #222 · Ocean

The U.S. once detonated nuclear weapons underwater near its own ships for testing.

Fact #2758 · Ocean

The deep-sea environment is near freezing in temperature.

Fact #1419 · Ocean

The highest recorded ocean wave exceeded 80 feet in height.

Fact #920 · Ocean

Plankton form the base of many marine food chains.

Fact #663 · Ocean

Only about 5% of the ocean has been explored by humans.

Fact #2776 · Ocean

There are deep ocean creatures that glow.

Fact #2292 · Ocean

Sea otters use rocks as tools to break open shellfish.

Fact #43 · Ocean