Scuba Diving

Scuba diving is swimming underwater, or taking part in another activity, while using a scuba set. By carrying a source of breathing gas (usually compressed air), the scuba diver is able to stay underwater longer than with the simple breath-holding techniques used in snorkeling and free-diving, and is not hindered by air lines to a remote air source. The scuba diver typically swims underwater by using fins attached to the feet. However, some divers also move around with the assistance of a DPV (diver propulsion vehicle), commonly called a "scooter", or by using surface-tethered devices called sleds pulled by a boat.



Over 70% of the earth's surface is covered with water. The allure and mystery of the underwater world has inspired the human imagination since prehistory, from the mythological monsters described by seafaring people, to the science fiction of Jules Verne and the modern underwater adventures in Hollywood films. Breath-hold diving, dangerous though it can be, has been used to collect pearls, sponges and valuable commodities from the sea floor for many generations.
Advances in underwater exploration began nearly three centuries ago using diving bells and large cumbersome sealed suits using pumped air from the surface. Only very recently advances in technology and mechanics have allowed people to visit this domain safely for exploration using comfortable, self-contained air delivery systems.

EQUIPMENTS
A scuba set is an independent breathing set that provides a scuba diver with the breathing gas necessary to breathe underwater during scuba diving. It is much used for sport diving and some sorts of work diving.
The word SCUBA is an acronym for Self-Contained Underwater Breathing Apparatus.

Modern scuba sets are of two types,

open-circuit
In Europe, it is often called an Aqualung. Here the diver breathes in from the equipment and the exhaled gas goes to waste in the surrounding water. This type of equipment is relatively simple, making it cheaper and more reliable.

closed-circuit/semi-closed circuit
It is also referred to as a Rebreather. diver breathes in from the set, and breathes back into the set where the exhaled gas is processed to make it fit to breathe again. These existed before the open-circuit sets and are still used, but they are used less than open-circuit sets.

Wonders of the Sea

Surfing

Love Surfing?



Surfing is a surface water sport in which the participant is carried along the face of a breaking wave, most commonly using a surfboard, although wave-riders may make use of kneeboards, body boards (aka boogie boards), kayaks, surf skis, and their own bodies. Surfing-related sports such as paddleboarding and sea kayaking do not require waves, and other derivative sports such as kitesurfing and windsurfing rely primarily on wind for power, yet all of these tools may as well be used to ride waves.
Two major subdivisions within contemporary stand-up surfing are reflected by the differences in surfboard design and riding style of longboarding and shortboarding.

Check this video: Catch me if you can!


(Video is created by youtube channel, 'amazingvideoz', http://www.youtube.com/amazingvideoz Background music is from Indian movie Don, starring Shahrukh Khan)

ORIGIN
The art of surfing was first observed by Europeans in 1767, by the crewmembers of the Dolphin at Tahiti. Later, Jackson Crane, serving under explorer Captain Cook, was the first American to witness surfing, in Hawaii in 1778.
Surfing was a central part of ancient Polynesian culture. The chief was the most skilled wave rider in the community with the best board made from the best tree. The ruling class had the best beaches and the best boards, and while commoners were not allowed on the same beaches, they could gain prestige by their ability to ride the surf on their extremely heavy boards.



ARTIFICIAL REEFS
The value of good surf has even prompted the construction of artificial reefs and sand bars to attract surf tourism. Of course, there is always the risk that one's holiday coincides with a "flat spell". Wave pools aim to solve that problem, by controlling all the elements that go into creating perfect surf, however there are only a handful of wave pools that can simulate good surfing waves, owing primarily to construction and operation costs and potential liability.



EQUIPMENT
Surfing can be done on various pieces of equipment, including surfboards, bodyboards, wave skis, kneeboards and surf mat. Surfboards were originally made of solid wood and were generally quite large and heavy. Lighter balsa wood surfboards were a significant improvement, not only in portability, but also in increasing maneuverability on the wave.
Most modern surfboards are made of polyurethane foam, fiberglass cloth, and polyester resin. An emerging surf technology is an epoxy surfboard, which are stronger and lighter than traditional fiberglass. Even newer surfboard designs incorporate materials such as carbon fiber and springy 'firewire'.
Equipment used in surfing includes a leash (to stop a surfer's board from washing to shore after a "wipeout", and to prevent it from hitting other surfers), surf wax and/or traction pads (to keep a surfer's feet from slipping off the deck of the board), and "fins" (also known as "skegs") which can either be permanently attached ("glassed-on") or interchangeable. In warmer climates swimsuits, surf trunks or boardshorts are worn, and occasionally rash guards; in cold water surfers can opt to wear wetsuits, boots, hoods, and gloves to protect them against lower water temperatures.

HOLLYWOOD ON SURFING
Some hollywood movies on surfing,


Big Wednesday


Pointbreak


North Shore


Blue Crush

COMPUTER GAMES ON SURFING
Surfing H30 for PlayStation2
Kelly Slater's Pro Surfer
Surf's Up

Skates

Check this video: Krazzy 4 Skates

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