Always/Never: The Quest for Safety, Control, and Survivability - Part 1

For any engineer interested in nuclear weapons, I highly recommend this three-part series produced by Sandia National Laboratory on their development of Permissive Action Link, the warhead’s electrical isolation and cryptological module that ensures US nuclear weapons will detonate if any only if authorized by the President. It’s fascinating how they thought about bad path scenarios like thermal damage causing carbon tracking of PCBs potentially defeating the control system. It is called “Always/Never: The Quest for Safety, Control, and Survivability” Part 1: ▶ this video Part 2: [link] Part 3: [link]

in “The Albuquerque "Broken Arrow" Nuclear Accident” · View on HN

There is an excellent three part documentary from Sandia National Labs: "Always/Never: The Quest for Safety, Control, and Survivability." (part 1) ▶ this video They cover both the technology itself and its history, including the incidents you are reading about. These people are the ones who developed the methodology and the technology for nuclear device safety, or at least a significant chunk of it. I think it has recently become much more mathematically heavy, with zero knowledge proofs and other fancy stuff used to talk to the locks in the devices.

in “Lost Images from the 1945 Trinity Nuclear Test Restored” · View on HN

> "Always/Never" shares the story of the national labs’ history of work for the safety and security of nuclear weapons. ▶ this video

in “Remembering the night two atomic bombs fell on North Carolina” · View on HN