Smoke in the suburbs of Athens July 20, 1965: The submersible research vessel Alvin makes its first dive for the Woods Hole Oceanographic Institute. Alvin dives 6,000 feet into the Atlantic.

July 20, 1977: History repeats itself as Johnstown, Pennsylvania, is engulfed in a flash flood, killing 85 people. In the more famous, original Johnstown Flood in 1889, a single dam failed, bringing an estimated 20 million gallons of water down on the town and killing 2,209. The 1977 flood was preceded by nearly a foot of rainfall. Five dams failed, carrying an estimated 128 million gallons of water into Johnstown.

July 20, 2007: The 100th blaze of firiest summers in Greek history starts. From the suburbs of Athens (at right) to the island of Crete, more than 670,000 acres burn, and 87 people die.

July 20, 2012: The U.S. Geological Survey releases a report with damning implications for mountaintop removal coalmining sites: The controversial mining method releases high levels of several toxic compounds into local soil and waterways.

Photo: Vberger/Wikimedia Commons

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.

July 20
Alvin dives into the Atlantic, and Greece burns with fires all across the country.