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A dark, ash-laden cloud is ejected from a submarine vent at Anak Krakatau (Child of Krakatau) on June 12, 1930. A white steam column rises above a pyroclastic-surge that travels horizontally along the sea surface in a radial direction from the vent. Base surges such as these are a common phenomenon of submarine eruptions. The first eruptions of Anak Krakatau to breach the surface were seen in December 1927.