The division between the races has long been a feature of post-Imperial Equestria. But even as recently as a few decades ago, the three tribes were willing to cooperate to a limited degree.

Then one mistake changed everything. Join me, and discover how one cataclysmic event thirty years ago defined the relations of three races for decades, as well as why unicorns are deathly afraid of mayonnaise.

Inspired by the HBO Series Chernobyl and a rather strange discussion in this thread.

With thanks to user Huk for helping with adapting nuclear power to the G5 setting.

Written for the Hot Pony Summer Contest.