This is also the largest octopus hatchery in the world on a first discovered undersea volcano.
Research using robotic submarines to explore the Havre underwater volcano can change people's understanding of what happens beneath the surface of the Earth.
Scientists say the key to the survival of the world's threatened coral reefs could be in the waters surrounding Shikine, a small volcanic island off the coast of Japan.
Tamu Massif is considered to be the largest volcano in the world, surprisingly it is located deep in the Pacific Ocean.