Now Playing: It's so cold, bubbles are freezing

Now Playing: People throw boiling water into freezing air to prove how cold it is

Now Playing: Steam rises off Lake Michigan in Chicago amid Midwest deep freeze

Now Playing: Drone footage shows melting Arctic sea ice

Now Playing: London seen from plane's cockpit

Now Playing: Beached whales, COVID-19 memorial, wildfires continue; World in Photos, Sept. 22

Now Playing: ABC News Live Update: Ruth Bader Ginsburg to be 1st woman to lie in state in Capitol

Now Playing: New precautions in place as cruise companies make a comeback in Europe

Now Playing: Crowd protests opera over lack of social distancing measures

Now Playing: Trash washes ashore on Honduras beach

Now Playing: Squirrel monkeys enjoy ice pieces

Now Playing: Ocean observation satellite launches from China

Now Playing: RBG, whales and California fires: World in Photos, Sept 21

Now Playing: Parrot calls 'time out' during soccer game in Brazil

Now Playing: Trump vows to ban TikTok, WeChat

Now Playing: Authorities warn about mosquitoes spreading Eastern equine encephalitis virus

Now Playing: Australian safari staff scare tourists with crocodile prank

Now Playing: Conservation officers capture and free bear into wild

Now Playing: ABC News Live Update: Russia calls new evidence in alleged Navalny poisoning ‘absurd’