Now Playing: Fire threat forcing Western towns to abandon July Fourth fireworks
Now Playing: Dramatic video shows fireworks explode inside car trunk
Now Playing: 3 popular travel vloggers die in waterfall accident
Now Playing: What to expect as US-China trade war begins
Now Playing: Soccer teammates speak out about boys stuck in Thai cave
Now Playing: Deadly firework explosions just north of Mexico City
Now Playing: Another nerve agent poisoning exposed to a couple in UK town
Now Playing: Thai cave rescue: the race against the rain
Now Playing: Rescue in Thailand: Water levels dropping as workers pump water from cave
Now Playing: Volunteers pour in to help Thai boys stuck in cave
Now Playing: Rescue efforts in Thailand face challenges
Now Playing: Crews working to pump water out of cave in Thailand
Now Playing: Novichok expert weighs in on poison that sickened UK couple
Now Playing: A look inside Thai cave where boys remain trapped
Now Playing: What it’s like in the Thailand caves where 13 are trapped
Now Playing: Thai cave conditions challenge rescuers
Now Playing: Second nerve agent attack in England
Now Playing: Chilean miner rescued in 2010 has message of hope for stranded boys
Now Playing: Couple in UK exposed to same poison as ex-spy
Now Playing: Rescuers rush to help boys stranded in cave before monsoon hits
Free America Network Articles