Now Playing: New Satellite Images Reveal Possible Objects in Indian Ocean

Now Playing: Missing Malaysia Plane: Radar Hits of 'Significant Size' in Indian Ocean

Now Playing: Mystery of Missing Malaysia Flight 370 Focuses off Australia

Now Playing: EXCLUSIVE: David Wright Aboard Navy Search and Rescue Plane

Now Playing: EXCLUSIVE: David Wright Reports as US Navy Plane Zeroes in on Debris

Now Playing: Families of Missing Plane Passengers Reach Boiling Point

Now Playing: 'This Week': Malaysia Air Mystery

Now Playing: Crews Search for Missing Plane Off Australia's Coast

Now Playing: Exclusive: ABC's David Wright Aboard US Navy Aircraft

Now Playing: Families of Missing Passengers Reaching a Boiling Point

Now Playing: 'This Week': Investigating Malaysia Air 370

Now Playing: Trump announces US troop increase in Afghanistan

Now Playing: Total solar eclipse experience from coast to coast

Now Playing: How eclipse chasers, small towns prepared for total solar eclipse

Now Playing: Remembering comedic icon Jerry Lewis

Now Playing: Mother of Heather Heyer, who was killed in Charlottesville, discusses President Trump

Now Playing: White nationalist Richard Spencer and Antifa member meet

Now Playing: Barcelona terror attack eyewitnesses describe chaotic scene

Now Playing: Cliff diver describes the impact of a 90-foot-plunge off Ireland's coast

Now Playing: Red Sox fan throws an unforgettable first pitch