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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]
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.
The copper helmeted, free-flow, standard diving dress is the version which made commercial diving a viable occupation, and although still used in some regions, this heavy equipment has been superseded by lighter free-flow helmets, and to a large extent, lightweight demand helmets, band masks and full-face diving masks.
Environmental problems, situations, effects, or influences such as unforecast weather deterioration, stronger current than anticipated, unexpected low water temperature, silt-out, inadvertent entry into a confined space or overhead environment in low visibility without a guideline to open water, entrapment by nets, lines, wreckage, delta-p ...
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
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 regulations will probably require a documentary record of the risk assessment associated with the dive, a documented dive plan for the specific dive, an operations manual specifying the accepted equipment and procedures, checklists for preparation and pre-dive checks, and a record of the timeline and depths of the diving operation in the ...
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 ...