Kurose Hole
"Kurose Hole, between Mikura and Hachijo-jima islands, is a nearly circular 5-7 km wide submarine caldera with a 600-760 m deep caldera floor. A flat-topped somma rim rises to within 107 m of the sea surface. Large amounts of dacitic pumice were recovered from dredges along the inner caldera wall. Kurose caldera has a youthful morphology, but the age of its most recent eruption is not known."  -Smithsonian Volcano Archive
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