<P> No specific targets for the weapon were identified, but in 2013 New Zealand broadcaster and author Ray Waru suggested coastal fortifications in Japan ahead of an invasion of the Japanese home islands . </P> <P> Egyptian magazine Al - Osboa claimed that the 2004 Indian Ocean earthquake and tsunami was intentionally caused by a nuclear weapon detonated in a strategic position under the ocean . </P> <P> The bouncing bomb was a 5 - ton bomb developed, separately, during World War II . Like the tsunami bomb, it was also designed to explode in water, and one of its intended effects was to cause massive flooding . However its targets were the massive reinforced dams of Nazi Germany, which were deemed untouchable by ordinary weapons yet, if broken, would cause extensive harm to Germany's war effort . The bombs' most unusual feature was that they were deliberately spun backwards before dropping; this backspin caused them to skip along the surface of the water for a set distance before sinking, and allowed them to evade torpedo nets that protected the dams before exploding underwater similarly to a depth charge . The inventor of the first such bomb was the British engineer Barnes Wallis, whose "Upkeep" bouncing bomb was used in the RAF's Operation Chastise of May 1943 to bounce into German dams and explode underwater, with effect similar to the underground detonation of the Grand Slam and Tallboy earthquake bombs, both of which he also invented . His April 1942 paper "Spherical Bomb--Surface Torpedo" described this method of attack . The weapons were used successfully against three dams in 1943, giving rise to the name "Dambusters" which was used by the squadron undertaking the attacks, and in many media portrayals, and entered the English language afterwards . </P> <P> The earthquake bomb, or seismic bomb, was a separate but related concept that was separately invented by the British aeronautical engineer Barnes Wallis early in World War II and subsequently developed and used on land against strategic targets in Europe . The earthquake bomb also used the concept of an explosion in a dense medium . It differed somewhat in concept from traditional aircraft - borne bombs, which usually explode at or near the surface, and destroy their target directly by explosive force . By contrast, an earthquake bomb is dropped from very high altitude to gain more speed, and upon impact penetrates and explodes deep underground ("camouflet"), causing massive caverns or craters as well as much more severe shockwaves . In this way, they can affect targets that are too massive to be affected by other types of conventional bomb, as well as difficult targets such as bridges and viaducts . Earthquake bombs were used towards the end of World War II for massively reinforced installations (e.g., submarine pens with concrete walls several meters thick, underground caverns, buried tunnels), and bridges . </P>

Only a nuclear explosive can generate a mega ton explosion