May 20
In this May 17, 1980 photo, 30-year old vulcanologist David Johnston is shown in the evening at his camp near what is now known as Johnston Ridge near Mount St. Helens. At 8:32 a.m. the next morning, Johnston radioed a message to the USGS headquarters: “Vancouver, Vancouver, this is it!”, shortly before he was killed by the massive eruption of the volcano that also killed 56 others. (AP Photo/USGS Cascades Volcano Observatory, Harry Glicken)

In this May 17, 1980 photo, 30-year old vulcanologist David Johnston is shown in the evening at his camp near what is now known as Johnston Ridge near Mount St. Helens. At 8:32 a.m. the next morning, Johnston radioed a message to the USGS headquarters: “Vancouver, Vancouver, this is it!”, shortly before he was killed by the massive eruption of the volcano that also killed 56 others. (AP Photo/USGS Cascades Volcano Observatory, Harry Glicken)