Beijing: China is planning to deploy its indigenous deep sea manned submersible diving vehicle to locate the black-box of the missing Malaysian airliner since the searches are centered at an area of the remote Indian Ocean.
According to experts, the depth of water in the area having 50-km radius can exceed 4,500 meters, thus making the searchers as an extremely challenging job.
Currently, US Navy has deployed a pinger locator and an unmanned submersible Bluefin-21 underwater autonomous vehicle near the coast off Perth in Australia to find the black boxes of MH370. Since the signals from the black boxes seems to have died, deep searchers are the only possible alternative.
But once the location of the black boxes are confirmed, any salvage operation will have to face the threat of strong under water currents as well as the absence of natural light. Moreover, the crushing pressure under the water can be overtaken by only a handful of manned vessels in the world.
Out of the 239 people, on board of the ill-fated Beijing-bound flight from Kula Lumpur, 154 were from China. Hence, Beijing is under tremendous pressure to find out what happened to the Malaysian airliner.

Video on the functioning of the black box detector