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.

energy=mass x the speed of light squared.
its like a spacetime sneeze.

Well that’s the thing, conventional explosions convert chemical bonds into energy. Chemical bonds are fairly weak in the grand scheme of things.

Nuclear weapons convert nuclear bonds into energy. Atoms really like staying the atoms they currently are, so forcing them to convert all at once releases a ton of energy.