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a person swimming in a pool of waterAs one of Hawaii’s most popular scuba diving businesses, we have picked up a lot of weird and often useless facts about scuba diving over the years.

Here are some of the most unusual things we’ve learned while guiding thousands of happy customers through the wonders of the underwater world:

Scuba Diving Hawaii – The Meaning of It All

Scuba diving is so popular that when you say the word “scuba”, everybody automatically knows what you are talking about. But “scuba” is actually “S.C.U.B.A.”, an acronym for “self -contained underwater breathing apparatus”.

And it’s only been around since 1943¬†when it was invented by legendary diver Jacques Cousteau, a very interesting man who once had a top-rated documentary TV show.

Cousteau called the oxygen cylinders he invented the “Aqualung”, which went on to become the name of a hit song by the rock band Jethro Tull in the 1970s.

Scuba Diving Hawaii – Underwater Facts

Once you dive below 10 meters in depth, the human eye can’t see the colors red or yellow. Reds look like blue.

Did you hear that? Underwater, sound travels about five times faster than it does in the air. So when you hear a sound underwater, the mind often has a hard time telling where it is coming from because our brains are accustomed to measuring distance by the time difference created by air density rather than water density.

At very deep depths — lower than 42 meters — pressurized oxygen can be potentially toxic to humans. That’s why special tanks containing low oxygen are used for deep diving.

At depths lower than 25 meters, breathing nitrogen cause nitrogen narcosis, a feeling like being a little drunk. It happens to everybody.

Scared of sharks? They should be scared of you. Each year sharks kill about 8 to 12 people, but people kill between 25 and 30 million sharks.