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Well this is a thing that happens.

The ocean looks blue because water absorbs longer-wavelength colors of light more strongly than it does blue. When the sun’s white light enters the ocean, red/orange/yellow light dissipates quickly, and mostly blues remain. That’s why divers stop seeing reds around depths of 20 feet, but blues last until it’s too dark to see. Source Source 2

A swim through a Finnish pond

The areas that were covered with thick ice sheets in the ice ages that ended some 12,000 years ago are covered with lakes and ponds of many sizes, many of which are a beautiful blue or green colour, though in the case of spotted lake (see http://bit.ly/29kJQzp) something more surreal can result.

Loz

Image credit: Audionautix

http://bit.ly/29xKHcs

Divers thought they found a real-life Atlantis after discovering ‘pillars’ and 'paved floors’ off the coast of Greece, but the strange rock formations were actually created by concretion, a natural phenomenon where cement forms in the sediment when microbes use methane that escapes from the sea floor as a source of energy. Source Source 2

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Swimming with a sea turtle on a coral reef near Hawaii surrounded by a school of fish. That sounds pretty cool.

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Artificial “gills” could allow us to breathe underwater

A crowdfunding campaign for a product that claims to allow humans to breathe underwater without the use of scuba equipment has raised over a half million dollars so far. The Triton — “artificial gills” that will work similarly to gills on fish — supposedly allows swimmers to breathe underwater.

However, there are some individuals who believe that we are still far away from being able to breathe underwater without scuba gear, and that the Triton product may potentially be dangerous.

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Whoa.