Red Light

While blue and green light remains in effect from 0-100ft. Red light dissappears at maximum depths of 20ft and beyond. A scuba diver can use a red light filter in order to convey the lush reds of their surrounding oceanic environments. I used a red light filter (see picture below) to capture the beautiful reds and pinks of the rock and sea plant, blowing in the Kauai current. The red light makes all the difference in capturing the missing colours of red down 20ft and beyond. 

Sources

• Freeman, Michael. The 35mm Handbook: A Complete Course from Basic Techniques to Professional Applications. New York: Ziff Davis, 1980. Print.
• Bendavid-Val, Leah. "The Great Ocean of Discovery." National Geographic: The Photographs. N.p.: National Geograph Society Book Division, 1994. 189-230. Print.

A Breif History of Underwater Photography:

In 1893: the first black and white photographs were invented. Then 34 years later, in 1927, the first colour photograph was published in the National Geography. The voyage of the Calypso vessel in 1955 marked the early, first beginnings of Underwater Photography. 

The Scientific Advances of Underwater Photography:

Emory Kristof and Chandler, both underwater photographers, (one of whom was working for the National Geographic); intended to find the Loch ness Monster in 1976 using bait and sonar equipment. This, although an unsuccessful venture, turned out to be so when two new animal species were discovered by the divers: clumps of giant sea clams and several feet long tube worms. 

Despite underwater photography being universally known as artistic, it also is prone to scientific discoveries new to mankind. As a diver  you are one of many whom has the ability to discover new and exotic species.