Obviously, the 'Tsunami Bomb' tested on Japan...
'Tsunami bomb' tested off New Zealand coast
telegraph.co.uk | 01 Jan 2013
The tests were carried out in waters around New Caledonia and Auckland during the Second World War and showed that the weapon was feasible and a series of 10 large offshore blasts could potentially create a 33-foot tsunami capable of inundating a small city.
The top secret operation, code-named "Project Seal", tested the doomsday device as a possible rival to the nuclear bomb. About 3,700 bombs were exploded during the tests, first in New Caledonia and later at Whangaparaoa Peninsula, near Auckland...
...if the atomic bomb had not worked as well as it did, we might have been tsunami-ing people...
...New Zealand seems to have successfully developed it to the degree that it might have worked. The project was launched in June 1944 after a US naval officer, E A Gibson, noticed that blasting operations to clear coral reefs around Pacific islands sometimes produced a large wave, raising the possibility of creating a "tsunami bomb"...more...