Recovery
See also: Lifting bag and Marine salvageRecovery techniques depend upon the type and size of the object.
Smaller objects, such as a coin or camera, can simply be carried up by the diver. Training agencies vary in what they specify to be the maximum weight that can be safely carried up unassisted, but normally the limit is set around 15 pounds (7 kg). Anything heavier represents a material change to the diver's buoyancy control, and may put the diver at risk from an uncontrolled ascent if contact with the object is lost during ascent.
Medium sized objects are normally recovered using a lifting bag, and students are trained in lifting bag technique. The most common hazard is entanglement with lines whilst filling the lifting bag from the diver's alternate air source. This risk, when coupled with the possibility of rapid ascent following the freeing of the object from suction caused by it resting upon the sea bed, can seriously compromise the safety of the recovery team if done improperly. Lift bags can be rated up to several tons, but these are beyond the capacity of most recreational divers.
Significantly larger objects usually require specialised commercial lifting equipment, either a winch attached to a boat or platform, or specialised equipment to seal and inflate sunken vessels.
Read more about this topic: Underwater Search And Recovery
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