"A submarine eruption was reported by a ship captain in 1850 midway between Taiwan and the Marianas Islands at a location where the average water depth is 6000 m (Catalog of Active Volcanoes of the World). A sudden commotion of the sea, a rise of air temperature, and sulfur smell were observed. Sapper (1927) listed an eruption here in 1854 that does not correspond to the location on his map. The validity of these reports is uncertain."  -Smithsonian Volcano Archive
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