Why Not Raise AirAsia Aircraft Accident Debris?

Delays in recovering AirAsia QZ8501 are frustrating; at times it’s as though salvagers are dragging their feet. The wreckage is located, the black boxes recovered. Why not just bring it up?
That’s not always so easy. To begin with, enough people have perished; to rush the task puts numerous recovery workers at risk. The wreckage is 105 feet down; by contrast the Andrea Doria, a favorite diving site is 190 feet down and accessible to divers. However, diving times are restricted to prevent, e.g. ‘the bends’.
There are two priorities: ‘black boxes’, which have been recovered; and the victims. Depending on a wreckage’s position, the boxes aren’t always accessible. The victims must be recovered, not only out of decency, but because they’re a safety risk; they attract scavengers; their condition may give information; or their location could block crucial evidence, e.g. the pilot blocking the gauges.
The aircraft does not rest on the bottom in the same condition it entered; impact forces, even into water, will rend the fuselage like tissue paper. Strong underwater currents inhibit movement or lift silt. Heavy fuselage or engine sections sink into the soft floor; recovery members must break the suction and/or burrow under the wreckage to get a strong attach point without destroying the wreckage. Meanwhile, surface ships may be tossed by waves or storms, making lifting difficult.
The deep waters of any sea can be selfish and cruel. There is no need to foolishly feed its appetite for tragedy.

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