Whois & Analysis for atlanticedge.com

Scuba diving is a mode of underwater diving in which the scuba diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater.

Unlike other modes of diving, which rely either on breath-hold or on breathing supplied under pressure from the surface, scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold.

Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a diving regulator.

They may include additional cylinders for decompression gas or emergency breathing gas.

Closed-circuit or semi-closed circuit rebreather scuba systems allow recycling of exhaled gases.

The volume of gas used is reduced compared to that of open circuit; therefore, a smaller cylinder or cylinders, may be used for an equivalent dive duration.

Rebreathers extend the time spent underwater compared to open circuit for the same gas consumption, they produce fewer bubbles and less noise than scuba which makes them attractive to covert military divers to avoid detection, scientific divers to avoid disturbing marine animals, and media divers to avoid bubble interference.

The National Aquarium (formerly known as the National Aquarium in Baltimore) is a non-profit public aquarium located at 501 E Pratt Street in the Inner Harbor area of Baltimore, Maryland in the United States.

Constructed during a period of urban renewal in Baltimore, the aquarium opened on August 8, 1981.

The aquarium has an annual attendance of 1.5 million.

The Aquarium holds more than of water, and has more than 17,000 specimens representing over 750 species.

In 2003, the National Aquarium and the independent National Aquarium in Washington joined as one National Aquarium.

The National Aquarium's mission is to inspire conservation of the world's aquatic treasures.

The aquarium's stated vision is to confront pressing issues facing global aquatic habitats through pioneering science, conservation, and educational programming.

A dive center is the base location where recreational divers usually learn scuba diving or make guided dive trips at new locations.

Many dive centers operate under the guidelines of ISO 24803, in which case the facilities must meet the ISO minimum standard for a service provider for recreational diving.