1Zooplankton Density
There are more multi-cellular zooplanktons per square kilometer in the Chukchi Sea than there are stars in the Milky Way and collectively there are more planktons than there are galaxies in the observable universe.
2. There is an area in the middle of the Pacific Ocean where spacecrafts that are no longer needed have been routinely deposited. It is known as the "Spacecraft Cemetery," and notably it is also the place where the defunct Mir space station rests.
3. The "Blue Hole" in Red Sea is a dive site which is reputed to have the most diver fatalities in the world with estimates of between 130 and 200 fatalities in recent years. One of these deaths is recorded in full on a dive camera.
4. "Southern Ocean" is a 5th ocean in the world. One reason for considering it as a separate ocean stems from the fact that much of the water of the Southern Ocean differs from the water in the other oceans.
5. The Gulf of Mexico has a dead zone, an area of hypoxic (less than 2 ppm dissolved oxygen) waters, which supports fewer organisms and has been linked to massive fish kills and can cover up to 6,000-7,000 square miles (9656-11265 square kilometers) at the mouth of the Mississippi River.
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6Mediterranean Sea Hidden Salt Layer
There is a 1.5 km thick layer of salt deep beneath the sea floor of the Mediterranean Sea from the near complete drying up of the Mediterranean Sea 5.5 million years ago.
7. There was once a plan to drain a part of the North Sea (using dams) to increase the livable area of Europe and connect the British Isles to continental Europe.
8. During the 2004 Indian Ocean earthquake and tsunami on 26 December 2004, fishermen said they saw with their own eyes "the reality of generations of legends the remains of ancient temples and hundreds of refrigerator-sized blocks, all briefly exposed before the sea swallowed them up again."
9. Hudson Bay and its shores are populated by more Beluga whales than people.
10. The Ross Sea in the Southern Ocean near Antarctic is the most pristine marine ecosystem on earth. It is a living laboratory for scientists. Commercial fishing for the Antarctic Toothfish in the area however has threatened to destroy its natural balance.
11Pacific Ocean Is Shrinking
The Pacific Ocean is getting smaller and the Atlantic Ocean is getting bigger due to the shifting of the Tectonic Plates.
12. The Baltic Sea doesn't mix with the North Sea due to the difference in their density.
13. The Caspian Sea is actually a lake and it is so large that it accounts for 44% of the world's lake water.
14. The Caribbean Sea makes a whistling sound that can be heard from space.
15. The Aegean Sea is named after Aegeus, the father of Theseus. Aegeus told Theseus to put up white sails when returning if he was successful in killing the Minotaur. Theseus forgot & Aegeus subsequently drowned himself in the sea.
16Baltic Sea
The youngest sea in the world is the Baltic Sea which is between 10,000 - 15,000 years old.
17. A huge sunken land-mass in the Pacific Ocean, dubbed Zealandia was spied from space, and scientists favor it being formally recognized as the 8th continent, of which New Zealand is its only visible portion.
18. In the 19th century, scientists had theorized that the Arctic Ocean got warmer as it got closer to the North Pole. They thought that the "Open Polar Sea" could provide trade routes through an equator-like temperate climate to Asia, Europe, and the Americas. It was later disproven by dozens of failed expeditions.
19. Tropical cyclones in the southern Atlantic Ocean are extremely rare, with only 1 hurricane in recorded history.
20. The deep ocean is heterogeneous and made up of discrete water masses, which can be tracked, measured, and dated with some water masses being up to 1,500 years old.
21Pacific Ocean's Vastness
The Pacific Ocean just by itself is bigger than all the continents put together.
22. When ships pass through Point Nemo in the southern Pacific Ocean, the closest other humans are in the International Space Station 400km up.
23. There is an intact cask of plutonium dioxide on the bottom of the Pacific Ocean because Apollo 13 failed to land on the moon.
24. The largest volcano on Earth is named Tamu Massif which is located at the bottom of the Pacific ocean. It has a surface area the same as New Mexico making it one of the largest volcanoes in the Solar System.
25. The Blob is a warm water event that took place in the Pacific Ocean that was first detected in 2013 and is still impacting wildlife and weather today.
