Originally Posted By: MMike
but when the bomb explodes, why there is no tsunami? because there will be a hole there (where the water is throw away by the bomb?

this is what i though it happen:because see this video:
tsunami with bomb

There probably is going to be a wave but it's no dramatic tsunami thing being able to cross huge distances and getting "dangerous". In addition to that for a real tsunami cubic kilometers of water need to be pushed - a nuke doesn't have that much power and vaporizes more than it really pushes...