7. Avalanche in Peru: In 1962 two American scientists, David Bernays and Charles Sawyer, had reported seeing a massive vertical slab of rock being undermined by a glacier, which threatened to fall and cause the obliteration of Yungay.
According to Sawyer, when this was reported in the Espreso newspaper (27 Sept., 1962), the government ordered them to retract or face prison, and they fled the country.
Citizens were forcibly prevented from speaking of an impending disaster.
Eight years later the prediction came true. More than 4,000 people were killed in the avalanche.