Copper and brass three bolt Soviet diving helmet. The Union of Soviet Socialist Republics (USSR was a constitutionally Socialist state that existed in Eurasia from 1922 to 1991

Diving helmets are worn by mainly by professional divers engaged in surface supplied diving. Hardhat diving redirects here Often "hardhat diving" is used to specifically mean diving in the old-type Standard diving dress. Surface supplied diving (also known as Hooka diving refers to divers using equipment supplied with Breathing gas using an umbilical cord

The helmet seals the whole of the diver's face from the water, allows the diver to see, provides the diver with breathing gas, provides an anchor point on the diver for the umbilical supplying the breathing gas, protects the diver's head when doing heavy or dangerous work, and provides voice communications with the surface. The term face refers to the central sense organ complex for those animals that have one normally on the ventral surface of the head and can depending on the definition In Psychology, visual perception is the ability to interpret information from Visible light reaching the Eyes The resulting Perception is also Air is the most common and only natural breathing gas. Other artificial gases either pure gases or mixtures of gases are used in breathing equipment and enclosed habitats such In Anatomy, the head of an Animal is the Rostral part (from Anatomical position that usually comprises the Brain, Eyes If the diver becomes unconscious, the helmet is more secure than breathing from a mouthpiece, which must be gripped between the teeth. See also Unconscious mind. Unconsciousness, more appropriately referred to as loss of Consciousness or lack of consciousness is

Types

Major types of deep sea diving helmets range from the "no bolt" helmet; two bolt to four bolt helmets; helmets with six, eight, or 12 bolts; and Two-Three, Twelve-Four, and Twleve-Six bolt helmets. The modern commercial helmet is the Superlite-17B helmet. Light-weight "transparent dome" type helmets used recreationally, or by television presenters who want the whole face to be seen by the audience. Television ( TV) is a widely used Telecommunication medium for sending ( Broadcasting) and receiving moving Images, either monochromatic

History

See Timeline of underwater technology#Diving helmets appear for the history of the diving helmet. This is a Timeline of Underwater Technology. The entries marked ## are about Decompression tables Pre-industrial

Nowadays

An alternative to the diving helmet that allows communication with the surface is the full face diving mask. A full-face diving mask is a type of Diving mask that seals the whole of the diver's Face from the water and contains a mouthpiece or Demand valve

Nowadays "diving helmet" sometimes means a hard safety helmet like a workman's helmet that covers the top and back of the head but not the face and does not keep air in and water out. A hard hat is a type of Helmet predominantly used in workplace environments such as Construction sites to protect the head from injury by falling objects

During the First World War the British Army used a few diving helmets out of water as emergency protection from mustard gas. World War I (abbreviated WWI; also known as the First World War, the Great War, and the War to End All The British Army is the land armed forces branch of the British Armed Forces. The sulfur mustards, of which mustard gas ( Bis (2-chloroethyl sulfide is a member are a class of related Cytotoxic, Vesicant Chemical

See also

• Standard diving dress
• Three bolt equipment

External links

• Modern helmet photo collection
• U.S. Navy Mark V Diving Helmet
• Diving helmets collection of Diving Heritage museum