Unpredictable world

The world in which we live is always transistionary in nature. We always look for permanancy in the work we do. Actually, we think exactly opposite to the nature . look at this volcano which erupted under sea. So far, we only saw volcano erupting above the surface.And we have been told by our geography teachers that this 75% of the globe is surrounded by water.

Now, how come the volcano erupted under the water . I have been told by my sailor friends many mountains (sometimes, even taller than Mt.Everest ) have been submerged by the oceans.