I'm writing a science fiction. i work in the HVAC industry because that's what job i ended up being forced to have in the Marine corps. in the book the character also works in the hvac field because he also did it in the Marine corps. and like me, he wanted to be a combat engineer and work with explosives because it's exciting. but i never got that opportunity, instead they gave me an actual career which i should be thankful for. now I'm writing a science fiction about this character and it's based in a post apocalyptic scene and I'm going to spice up the story with explosives if someone who knows what they are talking about would tell me a theoretical method.