Got some scientific questions regarding a Last Airbender fanfic I am writing, apologies for bringing my brainletism here but I can’t find everything on the internet.

My current understanding is that if you have easy access to 100% purity heavy water it would be pretty cheap to produce Pu-239 at the right isotopic purity for weapons. So right there you could be making fission bombs pretty easy if you had the explosives and electronics technology to get a prompt criticality. You could even do some fusion boosting the deuterium you get from electrolysis on the heavy water Is there a step in this process I am missing where effectively unlimited heavy water wouldn’t make the whole process relatively easy. As far as I could tell you would only need lithium 6 production to start making boosted weapons after this. Is there anything about this that’s retarded, don’t wanna write shit to find out the whole basis was wrong.

Anyway idea for story was that generations after aang took down ozai, the technological advancement happening in the fire nation continued throughout the world. Fearful of the fire nation the water tribes use their bending to make nukes really easily and the fire nation responds by starting a space program to harness fire bending (which is shown to be capable of thrust in the show) for spaceflight in order to put up rods-from-gods system. Then they do cold-war shit and it’s military/political drama in avatar with the cast composed of original series’ descendants.

So yeah how retarded is this?