American scientists predicted a devastaing avalanche in Peru, but no one listened. Unfortunately, they were right!
In 1962, American scientists David Bernays and Charles Sawyer, who were studying in Peru, reported seeing a huge vertical slab of rock being undermined by a glacier. They realized that should it fall, it would completely destroy the town of Yungay.
When David and Charles reported this information, the local government was furious. They ordered the two to either retract the information or leave the country. The scientists fled, and citizens were forced to keep quiet about the impending disaster.
Unfortunately, it still stuck. On May 30, 1970, an earthquake caused the unstable rock in the mountain to collapse. This caused the glacial ice to fall in an avalanche, which buried the town and killed 20,000 people. There were only 92 survivors!