On the other hand there were a number of vessels in the Pacfic that were seriously damaged by near misses both bombs and shells. With HE it is generally the shock wave/over pressure that does the damage rather than fragments. An underwater explosion produces a shock wave that can be damaging at greater distances than the same explosion in air. In any case the request was for a comparison. The information provided was designed to facilitate that. One would have to presume similar if not identical circumstances to readily compare the probable damage but without them being specified a comparison of the explosives seamed to me to be the best I could do. The question of whether the barges are a useful analog is also rather an open one. I'm not at all surprised that they were fairly resiliant to such damage. Being shallow draft and I suspect somewhat flexable would have mitigated a lot of the effects of a shock wave. A sub on the other hand can find even a fairly small leak to be quite dangerous.