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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]
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 ...
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.
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
Replacing an advertising poster in London using an aerial work platform. An aerial work platform (AWP), also an aerial device, aerial lift, boom lift, bucket truck, cherry picker, elevating work platform (EWP), mobile elevating work platform (MEWP), or scissor lift, is a mechanical device used to provide temporary access for people or equipment to inaccessible areas, usually at height.
Emergency free ascent (EFA) is like a controlled emergency swimming ascent without a regulator in the mouth. It is considered unacceptably hazardous for training purposes by some agencies. [6] [7] Emergency swimming ascent (ESA) is a free ascent where the diver swims to the surface at either negative or approximately neutral buoyancy.
Clearing a flooded demand valve is both a routine procedure and an emergency procedure. It is an emergency procedure because if the DV is not cleared, the diver could aspirate water and choke, but it can easily happen, and will happen when a diver switches to a different gas supply delivered through a different DV, and there are two easy ways to deal with it, so it should not be a problem on a ...