Finding and retrieving debris from the ocean floor

Investigators are poring over data captured by the Bluefin-21 sonar submarine. It is analyzing the ocean floor in hopes of catching the first glimpse of Flight 370. Anderson and CNN Analyst David Gallo take an up-close look at the type of images the Bluefin is collecting.

Once debris from Flight 370 is located, a different type of submersible will be called in. Gary Tuchman climbed inside a vessel that played a key role in finding pieces of the Space Shuttle Challenger.