Now Playing: Snow falls on Paris

Now Playing: An ice palace comes to frigid Pyeongchang ahead of Olympics

Now Playing: Stag stops by birdfeeder for a snack

Now Playing: 18 injured as burning van jumps curb in China; government rules out terrorism

Now Playing: Secret lives of polar bears revealed

Now Playing: Philippines volcano seen from space in satellite images

Now Playing: Truck plows over Peru's Nazca Lines

Now Playing: Cape Town tightens water restrictions as 'Day Zero' looms

Now Playing: North Korean spies attempted to sabotage the 1988 Olympics in Seoul

Now Playing: French authorities look for Quiksilver CEO in Atlantic

Now Playing: Russia's Olympic athletes get a patriotic send-off from Putin amid doping scandal

Now Playing: What I learned from watching a week of North Korean TV

Now Playing: Angelina Jolie joins forces with NATO to tackle crimes against women in war zones

Now Playing: Landscaper charged with killing 5 allegedly hid some remains in large planters: Cops

Now Playing: Putin says US Treasury list of Russian 'oligarchs' is an attack on Trump

Now Playing: More than 150 rescued after ski lift malfunctions

Now Playing: Hong Kong police defuse 1,000-lb. World War II-era bomb

Now Playing: Seine River reaches peak in flood-affected Paris

Now Playing: 11 killed in attack in Afghanistan, the latest in spate of violence

Now Playing: No boundaries: Elephant wanders across Laos-China border