More than 800 passengers and crew die when the ferry Estonia sinks in 1994.
The U.S. military's 1980 attempt to rescue American hostages in Iran.
Rescuers in lifeboats and helicopters worked for 20 hours to rescue sailors of the 303 yachts competing in the 1979 Fastnet Race.
The 1989 earthquake that hit the San Francisco Bay Area was the most-powerful earthquake to hit northern California for more than 80 years.
Thousands of people were exposed to radiation caused by a series of safety compromises that were believed to be deliberate.
Scientists and locals -- all working and living in the shadow of a natural time-bomb -- give their perspectives on the 1980 eruption of Mount St. Helens in Washington.
Eight Manchester United footballers were killed in a 1958 crash over German and it took the pilot 10 years to clear his name.