Skin Diver Manual

INDEX

Welcome to the underwater world!

Medical Check-up

Skin Diver Course Completion

Skin Diving Equipment

Gear Preparation and Maintenance

Using Your Equipment

Skin Diving Skill

Rules and Manners

Safety Management

Important Points for Ocean Practice
Ear Equalization

Mask Blow

Mask Clear

Dangerous Breathing Methods – Hyperventilation

Light and Color

Poisonous Sea Life 1

Poisonous Sea Life 2

Aggressive Sea Life

Transform into a Fish on your Holidays


Important Points for Ocean Practice


Light and Color

Underwater, things like fish appear 1 and 1/3 times larger and ¾ times closer due to light refraction as light enters the mask. As a result, when reaching out for something like a rope which will appear larger and closer than it really is, you should be careful not to misjudge distances.
As well, the deeper the water, the more light is absorbed, so first red, then orange, yellow, green, and finally, blue become more drab and hard to distinguish. However, use of a dive light will bring to light all the stunning colors of the ocean.


Light Extinction Coefficient

Sunlight

Violet

Blue

Green

Yellow

Orange

Red



Wow! What’s this?



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