lastmomentsalive on Instagram: "On May 18, 1980, Mount St. Helens erupted in one of the deadliest volcanic disasters in U.S. history. This haunting image is Johnston’s final photograph, taken just 13 hours before the eruption. Stationed near the volcano, volcanologist David A. Johnston famously radioed, “Vancouver, Vancouver, this is it,” moments before a massive lateral blast erased his position. He was among the 57 people killed as the explosion flattened forests, reshaped the mountain, and se