Even if investigators are able to locate the wreckage of Malaysia Airlines Flight 370 on the ocean floor, bring it to the surface will be a huge challenge.
MH370: Undersea search could cost a quarter billion dollars, official says
It could involve a manned expedition, three miles below the surface of the ocean.
CNN's David Mattingly is inside a manned submersible in Horseshoe Bay in Vancouver to show us what it's like.
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