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What Are the Dangers of Scuba Diving?
As scuba diving is a popular recreational sport, beautiful coral reefs and eerie shipwrecks around the world have become major tourist draws in their own right. However, it should not be forgotten that scuba diving is an extreme sport with its own peculiar injuries and potentially life-threatening hazards. Most of these scuba diving dangers stem from the effects of the increased water pressure of the undersea environment, but there are also dangers posed by sea life and faulty equipment.
Barotrauma is caused by the damage done by increased underwater pressure on the air pocket in the middle ear. Divers usually “equalize” during a dive by pinching their nose shut and blowing, by chewing or by swallowing to push more air into the middle air. However, a descent that is too rapid can overcome a diver’s ability to equalize and result in severe pain and even injury to the middle ear.
Often called “the bends,” decompression sickness is caused by increased underwater pressure causing the body’s tissues to absorb more nitrogen. If that pressure is suddenly reduced, this extra nitrogen forms potentially harmful bubbles. Deep divers return to the surface in carefully monitored stages so as to control the rate at which this absorbed nitrogen is released. Depending on the amount of nitrogen absorbed and the rate at which it was released, a case of the bends can range from aching joints or a skin rash to paralysis and death.
Another nitrogen-related danger is the narcotic effect of all that extra nitrogen in the body. Anyone who has had nitrous-oxide gas at the dentist is already familiar with this effect. Nitrogen narcosis is a danger because it impairs judgement and sensory perception. As with the bends, the degree of nitrogen narcosis is related to how deep a diver goes and how much nitrogen they absorb.
Oxygen toxicity is usually a problem only encountered by deep divers who go below 135 feet. Like nitrogen, the body absorbs extra oxygen under increased underwater pressure as well. For most divers this is not a problem, but at extreme depths so much extra oxygen is absorbed that this life-giving gas becomes toxic. The effects range from tunnel vision and/or nausea to twitching to loss of consciousness and/or seizures.
Another risk facing a diver who rapidly ascends to the surface is pulmonary embolism. The increased pressure of the undersea environment results in the gas a diver breathes becoming denser, as more gas is crammed into the same space under pressure. The gas held in the lungs will expand at the same rate that the pressure on the body is reduced, so a rapid ascent can cause the lungs to swell and even pop like a balloon. Scuba divers guard against pulmonary embolism by making slow, controlled ascents to the surface and by never holding their breath.
Divers should never forget that each dive is the equivalent of entering an untamed wilderness. While most sea creatures are not aggressive towards divers and attacks are extremely rare, incidents do happen and a diver cannot afford to forget that she is surrounded by wild animals. The famed TV wildlife host “Crocodile Hunter” Steve Irwin was killed in 2006 when he was stung through the chest by a stingray, a frequently encountered and usually harmless sea creature. Divers should always treat sea life with great care and respect.
Many casual scuba divers do not own their own equipment, and are therefore reliant on renting equipment from the scuba diving operator who is conducting their dive trip. A broken depth gauge could lead to a mild case of decompression sickness, while a bad regulator might result in drowning. A diver should always thoroughly check rented scuba diving equipment, and never be shy about asking for a new piece of gear if they suspect something is wrong with what they have.
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