I think the height of doomsday machine technology was Project Pluto back in the day. A Mach 3+ cruise missile with an unshielded nuclear reactor crisscrossing enemy territory. Flying around for months just irradiating everything in its path. A flying Fukushima.
I've read about this project, just when you think mans inhumanity to man could not get any worse, we develop a weapon like that. Thankfully nothing ever came of it.
