I did some rough calculations of how much energy the DART craft had and it was about 1/1000 of the atomic bomb over Hiroshima. 1/1000 doesn’t sound like much but this was just an initial try. And that’s still equivalent to 15 tons of TNT. Not bad. The problem with a nuke is you can’t just slam it in, you first have to slow down, match speeds , then land and tunnel into the middle of it . Maybe all doable but dang .