A large bubble of hydrogen emerges in the nuclear reactor, threatening to cause a catastrophic explosion. President Carter dispatches an envoy. The goal: to get control of the crisis. And Pennsylvania's leaders face a big moment, as they decide whether to evacuate the region.Listen ad-free on Wondery+ hereSupport us by supporting our sponsors!See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.