One of New Zealand's most active volcanoes erupted on December 9th, 2019.
Plumes of ash, volcanic rock, and scalding steam shot more than 12,000 feet into the air over White Island.
At least 16 people have died, two are still missing, and two dozen were injured.
Over the last month, New Zealand's geological monitoring agency had raised the volcanic-alert level there.
But according to Business Insider, experts say a blast like this couldn't have been easily predicted.