Now Playing: Japan Rocked by 8.9 Quake

Now Playing: Japan Earthquake Rattles Nuclear Plant

Now Playing: Small Child Rescued in Japan

Now Playing: Disaster in the Pacific

Now Playing: Assessing the Damage

Now Playing: Surviving a Tsunami

Now Playing: Imagining Disaster

Now Playing: Riveting Images From Japan

Now Playing: James Comey Part 6: Comey on a Trump impeachment

Now Playing: James Comey Part 5: Are there Trump tapes?

Now Playing: James Comey Part 4: Discussing Michael Flynn

Now Playing: James Comey Part 3: Trump asks for 'honest loyalty'

Now Playing: James Comey Part 2: The Hillary Clinton email investigation

Now Playing: James Comey Part 1: Telling Trump about the 'dossier'

Now Playing: Comey says his assumption Clinton would win was 'a factor' in email investigation

Now Playing: US and allies launch attacks on Syria

Now Playing: Iran, Russia should not associate with mass murder of innocent people: Trump

Now Playing: Pentagon officials remark on strikes in Syria

Now Playing: Strikes will establish a strong deterrent of chemical weapons: Trump

Now Playing: Couple drugged and blindfolded, and woman abducted in the middle of the night: Part 1