Now that Renesco Rocketman has revealed the secret of sandwich technology and directional warhead explosion, this can be published.
The torpedo has a warhead with three modes of detonation: fragmentation (detonation before a collision), high-explosive (at the time of a collision) and cumulative (detonation with a delay).
The video used cumulative warhead undermining.
The torpedo is 5 blocks wide, 1 block thick. In dyne 8 or 9, I do not remember. 2x2 gravity drive, raycast control or line of sight through OLS.
I do not upload the script, at least for now.