Now Playing: Meteorite lights up dark skies of Arctic Finland
Now Playing: American hostage mom speaks out about years in Taliban captivity
Now Playing: US service members restricted to base, alcohol prohibited after deadly crash in Okinawa
Now Playing: Rescue operation underway for missing submarine
Now Playing: Freed from Taliban, American hostage mom describes brutal treatment by captors
Now Playing: Navy and Air Force join the search for an Argentine submarine
Now Playing: Alabama pastors rally in opposition to Roy Moore
Now Playing: Signals from missing Argentine sub give hope for rescue effort
Now Playing: Search continues for missing Argentine submarine with 44 crew members onboard
Now Playing: Ongoing search for missing Argentinian submarine
Now Playing: Search for missing Argentine submarine with 44 crew members onboard
Now Playing: Zimbabwe president appears in public first time since apparent military coup
Now Playing: 150,000 malnourished children in Yemen could die if left untreated, according to the UN
Now Playing: Rare white moose spotted in Sweden
Now Playing: ‘Harry Potter’ cosplay takes over the streets of London
Now Playing: More French women are reporting incidents of sexual misconduct
Now Playing: Australian police discover $186 million of cocaine
Now Playing: What’s devastating the elephant population in Africa?
Now Playing: President Trump a hit among residents in Chinese neighborhood
Now Playing: UCLA basketball players apologize for shoplifting in China, thank Trump
