Just think, we have escaped massive Tsunami!
The decision by nuclear capable countries over the entire period since 1945, not to test detonate under the sea means massive waves never were propagated into helpless coastal communities, killing millions of lemmings who thought they were safe.
Hurray! We are all safe.... Just as well as we have discovered that there are colossal quantities of clathrates which would turn a 6.0 earthquake into a 9.3 earthquake, killing many more over an even more extensive area. What clever Admirals.