Now Playing: Trump says he has made a decision on Iran nuclear deal

Now Playing: John Kelly's facepalm at Trump's United Nations speech goes viral

Now Playing: Rescue efforts underway at school in Mexico after earthquake

Now Playing: View of Hurricane Maria in the Atlantic Ocean off Puerto Rico

Now Playing: Record-breaking year in cocaine seizures for the Coast Guard

Now Playing: 2 children pulled from collapsed Mexico City building

Now Playing: Drone video shows rescue efforts at Mexican school

Now Playing: Video shows high-rise wall collapse in Mexico City

Now Playing: The human tragedy of Mexico's 1985 earthquake

Now Playing: Rooftop fireball follows Mexico earthquake

Now Playing: Tales of survival from Mexico's 1985 earthquake

Now Playing: The devastating earthquake that struck Mexico in 1985

Now Playing: Rain fills Latvian man's car door

Now Playing: Rescuers desperately searching for survivors in collapsed school in Mexico City

Now Playing: Rescuers dig through collapsed Mexico City school

Now Playing: Myanmar leader says 'action will be taken' in Rohingya crisis

Now Playing: Gusts send outdoor furniture flying

Now Playing: Bystanders appear to be fired on during Russian military exercises

Now Playing: WWI U-boat found off Belgian coast

Now Playing: 'An Inconvenient Border' clip 1: Cruising North Korea's border with China