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Lift bag surfacing under vessel or structure and snagging on projection that punctures bag, or fouling propeller or rudder, etc. [69] Poor rigging causing damage to bag or cargo. [69] Marking lift bag or load with a surface marker buoy before lifting. Ensuring that lift takes place when surface vessels and structures are clear of the area. [5]
A complex and high-risk rescue would be to locate, free and bring to the surface a lost diver who is trapped underwater in an enclosed space such as a shipwreck or cave with limited breathing gas supplies. The sequence of potential activities needed in a generic rescue are: Recognising or identifying the need for a rescue
The system is likely to be effective in mitigating out-of-air emergencies, non-diving medical emergencies and entrapment in ropes or nets. When used with the buddy check it can help avoid the omission, misuse and failure of diving equipment, though the use of a written checklist is more reliable. [77]
The risk of entrapment is often greater with smaller diameter line, and larger mesh nets. Fortunately these are also less work to cut free if a suitable implement is available. Entanglement is a far greater risk to divers with a limited breathing gas supply, and without communications to a stand-by diver.
Equipment failures that constitute an emergency are usually failures of life-support equipment, but also can be failures of other equipment that make it difficult, dangerous, or impossible to properly operate safety critical equipment, or to reach a place of safety, such as dive computer lockout or failure with decompression obligation ...
It is usually possible for trapped diver to inform the surface of the problem, so the standby diver can tool up for the job. Unless the entrapment also cuts off the main breathing gas supply, entrapment is not generally immediately life-threatening. Assessing the problem is also facilitated if diver has hat video. [1] [5]: 11–8
The NOAA Diving Manual: Diving for Science and Technology is a book originally published by the US Department of Commerce for use as training and operational guidance for National Oceanographic and Atmospheric Administration divers.
Where reasonably practicable, checklists may be used to ensure that preparatory and maintenance procedures are carried out in the correct sequence and that no steps are inadvertently omitted. [2] [3] [4] Some procedures are common to all manned modes of diving, but most are specific to the mode of diving and many are specific to the equipment ...