There are lots of underwater volcanoes, they are found deep in the ocean.
Here is a link to a video of one erupting: http://www.scientificamerican.com/article/undersea-volcano-explodes-as-scientists-watch-video/
Because there is so much water, the magma quickly solidifies and bubbles of hot water move to the surface instead. Hydrothermal vents are found near ocean volcanoes, and lots of sea creatures live near there.
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