To my best knowledge, this hasn't been suggested yet, nor is it a denied request (and I searched this time!), so I don't feel that anything's wrong here.
Sometimes, I listen to the sounds that IC2's items make, and I find that they're just kinda...meh. Probably the most glaring example of this would be the Nuke.
So, I thought to myself, "Why not bring forth some sounds that Al and the rest of the IC2 team could add?"
As noted, the Nuke's explosion doesn't really cut it for me. So, I submit the sound at 6:10 in this vid as a potential candidate.
Building off the Nuke some more, perhaps when it's lit, it might also give off a VERY clear warning sound, such as this air raid siren? It'd certainly get the point across.
Beyond that, I don't know what else could be added, but it's a start.