So far, the search for Flight 370 has not turned up any sign of the missing plane. But if it is found in the area where searchers are looking, the next step will be to call in submarines to retrieve it. David Mattingly is in British Columbia's Horseshoe Bay to demonstrate one of the tools needed to cut through a tangle of debris on the ocean floor.

If Flight 370 is spotted in the depths of the Indian Ocean, high tech submarines will likely be sent in to retrieve it. David Mattingly is in Horseshoe Bay in British Columbia for a first-hand look at how a submarine's claw can pick up objects.