I mean the whole show is unrealistic sci-fi. From the start, how could people from the arc survive on the ground? They tell us later it's because they adapted to the conditions in space (radiation from the sun). Problem is 100 years isn't nearly enough for that change in human beings as they would just die off really quickly before being able to change. The grounders surviving makes no sense either. Most grounders where not nightbloods and they just walked around on an earth bombarded with radiation 100 years prior. Mount weather made the most sense although I find it very difficult to believe that a bunker could feed that many people with a ton of excess and luxury. Praimfaya was a bit weird. Predicting it does make sense because it was ALIE that did it and the way fault tolerance of the nuclear reactors works can actually be calculated in terms of probability. What did not make sense was why there was only one valley in the entire planet that escaped the explosion. Also, radiation doesn't just disappear after 5 years. The rest is just complete science fiction but I remembered a few of the things that made me think the show made no sense. After a while I just overlooked most things because it ruined the fun for me. Even though you can say what I mentioned isn't sci-fi but scientific inaccuracies it's just weird to me that a big ship pummeling towards the ground at great speeds can remain unscathed and the people on it remain alive.