Kavachi
Kavachi is one of the most active submarine volcanoes in the south-west Pacific Ocean. Located south of Vangunu Island in the Solomon Islands, it is named after a sea god of the New Georgia Group islanders and is also referred to locally as Rejo te Kavachi ("Kavachi's oven"). The volcano has become emergent and then been eroded back into the sea at least eight times since its first recorded eruption in 1939. Geography 
In May 2000, an international research team aboard the CSIRO research vessel FRANKLIN fixed the position of the volcano at 8° 59.65'S, 157° 58.23'E. At that time the vent of the volcano was below sea level, but frequent eruptions ejected molten lava up to  above sea level, and sulfurous steam plumes up to . The team mapped a roughly conical feature rising from  water depth, with the volcano having a basal diameter of about . Eruptions 

When the volcano erupted in 2003, a  island formed above the surface, but it disappeared soon after. Additional eruptive activity was observed and reported in March 2004 and April 2007. More recent volcanic activity can be inferred from observations of discolored water around the volcano, in 2020 and January 2021. Marine life
In 2015, marine wildlife was found living inside Kavachi's crater, including the scalloped hammerhead, the silky shark, and the sixgill stingray. It has subsequently been given the nickname "Sharkcano" by various media outlets. See also
List of new islands
Woodlark Basin

References

Further reading
Baker, E.T., Massoth, G.J., de Ronde, C.E.J., Lupton, J.E., Lebon, G., and McInnes, B.I.A. 2002. Observations and sampling of an ongoing subsurface eruption of Kavachi volcano, Solomon Islands, May 2000, Geology, 30 (11), 975–978. (geology.geoscienceworld.org/cgi/reprint/30/11/975.pdf)
Dunkley, P.M., 1983. Volcanism and the evolution of the ensimatic Solomon Islands Arc, in Shimozuro, D. And Yokoyama, I.,(eds. ), Arc Volcanism: Physics and Tectonics. Tokyo, Terrapub, 225–241. Johnson, R.W. and Tuni, D. 1987. Kavachi, an active forearc volcano in the western Solomon Islands: Reported eruptions between 1950 and 1982, in B. Taylor and N.F. Exon, (eds. ), 1987, Marine Geology, Geophysics, and Geochemistry of the Woodlark Basin-Solomon Islands, Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, v. 7: Houston, Texas, Circum-Pacific Council for Energy and Mineral Resources. External links 
Kavachi in action

Active volcanoes
Submarine volcanoes
Volcanoes of the Solomon Islands
Seamounts of the Pacific Ocean
Ephemeral islands