What are the common causes of severe physical harm in recreational activities, such as skydiving, bungee jumping and scuba diving?
user
The most common causes of severe physical harm in recreational activities, such as skydiving, bungee jumping and scuba diving, are errors or recklessness in judgement due to lack of experience, failing to heed safety protocols and equipment malfunction. For example, skydivers can suffer parachute malfunctions that cause the fall from a great height at high speed without the protection of a parachute. Similarly, an incorrectly weighted bungee cord can cause the jumper to hit the ground with fatal velocity; divers suffering from equipment malfunction may become tangled in their breathing tubes or experience failure of their compressed air tank. 
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assistant
What are the common causes of severe physical harm in recreational activities, such as skydiving, bungee jumping and scuba diving?
user
The most common causes of severe physical harm in recreational activities such as skydiving, bungee jumping, and scuba diving are mid-air Collisions, Malfunctions or Errors in Equipment, Human Errors such as misjudging one's jump or depth, Underwater Entrapments or Haul Over's, Pressure Suit Problems and Inadequate Training.
 
Skydiving related accidents could happen when two parachutists colliding mid-air due to an inaccuracy in formation flying. Bungee jumping related injuries can result from incorrect deployment of the cords which cause severe whiplash or spleen injuries when there is improperly maintained equipment. Scuba divers can sustain spine and rib fractures from unexpected entanglement with underwater marine life like ropes or fishnets. Additionally they can get caught into pressure tanks if the tank valve doesn’t close properly leading to hazardous dive times or even fatalities. Human error also occurs while scuba diving such overexertion of depth leading to a potentially deadly blackout causing brain damage due oxygen depletion in the bloodstream. Other issues include problems with decompression caused by not waiting for proper intervals and fatigue which can lead a diver astray into oblivion below  The last cause relates to any lack of adequate training - failure to properly use safety protocols increases risks tremendously especially regarding equipment and judgement used outdoors at unique environments every time .
assistant
What are the common causes of severe physical harm in recreational activities, such as skydiving, bungee jumping and scuba diving?