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Related to active eruption: delayed eruption
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Since the water pressure at that depth suppresses the violence of the volcano's explosions, we could get an underwater robot within feet of the active eruption.
But the link between the large plumes and an active eruption was mostly an insightful inference that could not be confirmed by direct observation.
Still, mild to moderate activity has occurred since that time, with some of the more active eruptions taking place in 1519 and possibly 1663, said the Smithsonian Institution.