11. The tunnel itself is nearing completion, but the workers encounter a submarine volcano that will necessitate a detour. 12. Is a submarine volcano located about 450 kilometers south of Tokyo on the Izu-Ogasawara Ridge in the Izu Islands. 13. "' Banua Wuhu "'submarine volcano rises more than 400 m from the sea floor in the Sangihe Islands of Indonesia. 14. The island developed initially from a submarine volcano from the Pleistocene period that constructed small calderas and numerous pyroclastic cones. 15. These faults bound zones of rifts corresponding to an extension located on Roseau volcano ( an inactive submarine volcano ). 16. Along with the Emperor of China submarine volcano , the two twin forms a ridge ( NEC ridge ) on the seabed. 17. "' Suiyo Seamount "'is a seamount ( submarine volcano ) off the eastern coast of Japan, directly south of Japanese ). 18. An unnamed active submarine volcano rising to within of the sea surface is located } } due west of Dequey Island. 19. "' Bowie Seamount "'is a large submarine volcano in the northeastern Pacific Ocean, located west of Haida Gwaii, British Columbia, Canada. 20. The islands were created during the late Miocene period, from a large submarine volcano and shaped by erosion and marine sedimentation.
