8 points
Yea, the concentration of energy trapped in matter is immense. People say matter is energy and e=mc^2 but you really have to do the calculations to see how much work that c squared is doing. A small grain of sand is probably more energy than the largest bomb, but the hard part is converting that matter into energy.
A hydrogen bomb (even bigger than a nuke,) converts less than a percent of the matter in the bomb to energy.