Steam pours from the blocky summit of a lava dome formed at Myojin-sho during a submarine eruption at the Bayonnaise Rocks volcano in 1952. This September 22 photo was taken 6 days after the dome began to breach the sea surface. Later that day the eruption became highly explosive, and the dome was destroyed. Three cycles of dome growth and destruction occurred until October 1953. Myojin-sho is located on the eastern rim of a 7-9 km wide submarine caldera. (Photo: Helen Foster / USGS)