Them “pounds” was kilograms. 40 of ‘em would be about 100 pounds. That’s two cases of dynamite-—and with that much stuff one can do some serious damage, Not “nuke” level but enough to put a million gallon fuel tank out of bizness, roll over any armored vehicle, and make any bunker un-liveable. It could also put any light-armored ship out of action.
We had an operational nuke of just over 50 POUNDS in the 60s, and there are about 80 similar sized nukes still missing from the breakup of the Soviet Union.
Anything is possible.