Nazi Germany had no hope of making an atomic bomb, uranium cubes reveal
New research on Nazi Germany’s uranium cubes reinforces the view that the regime was far from being able to build an atomic bomb, due to fundamental scientific missteps, lack of industrial capacity, and the self-inflicted loss of talent through antisemitic policies. Commenters contrast this with the Manhattan Project’s massive scale and political backing, and note that even a working German reactor would not have translated into a deployable weapon during the war. The thread also branches into the ethics and legality of nuclear weapons use, Japan’s wartime and modern nuclear capabilities, and contemporary echoes in anti‑intellectual politics and debates over emerging technologies like AI.
German WWII nuclear efforts & limitations
- Farm Hall transcripts: captured German physicists were stunned by news of the U.S. bomb and struggled for weeks to reconstruct how it was done, often getting key details wrong.
- One key error: massive overestimation of required fissile material due to a flawed neutron “random walk” model; later work in Britain correctly modeled neutron diffusion and showed a much smaller critical mass.
- German program was tiny compared to the Manhattan Project (order of one researcher vs tens/hundreds of thousands).
- They pursued heavy-water reactors and never reached a working prototype; lacked enrichment and sufficient usable uranium at wartime scale.
- Allied disruption of heavy-water supplies and Germany’s late‑war industrial collapse further constrained feasibility.
Industrial capacity and delivery systems
- Several comments argue science was only half the problem; the other half was industrial scale and a reliable delivery platform.
- Manhattan costs were dominated by massive isotope‑separation plants; U.S. willingness to spend and mobilize far exceeded anything Germany managed.
- Debate on German options: missiles, scaled‑up V‑weapons, or U‑boats near U.S. coasts might deliver a bomb, but far less efficiently than a high‑altitude bomber.
- Some note that for strategic impact (e.g., terror or deterrence) even an “inefficient” or fixed-location device could still matter.
Role of racism and anti‑intellectualism
- Repeated points that Nazi ideology labeled relativity/quantum work as “Jewish science,” limiting support and driving key scientists abroad.
- Refugee and émigré scientists were central to Allied success; commenters see Nazi bigotry and anti‑intellectualism as a serious self‑inflicted handicap.
- One participant objects that racism alone does not fully explain failure, but others emphasize it clearly reduced German capability.
Japan, other programs, and postwar potential
- Japan had wartime nuclear projects but was described as “a long way” from a viable weapon; they were abandoned after surrender.
- Post‑Hiroshima, Japanese scientists reportedly investigated and confirmed an atomic blast, while leadership debated the implications.
- Modern Japan is described as a “latent” nuclear state with fuel‑cycle capability and plutonium stocks; one view holds it could build weapons within months, another is skeptical given enrichment challenges.
Technical clarifications on nuclear physics
- Explanations of bomb physics:
- Fission produces intense heat and x‑rays, turning surrounding air into plasma; that expanding, high‑pressure plasma drives the shockwave.
- Air vs ground vs underwater bursts redistribute energy differently; water can channel much of the energy sideways/down.
- Distinction drawn between bombs (rapid, uncontrolled energy release) and reactors (carefully managed heat removal).
- Natural reactors (e.g., Oklo) cited as evidence that material provenance and prior irradiation can be traced with high precision.
US nuclear use, legality, and modern fears
- Strong condemnation of the second U.S. bomb as one of history’s worst acts, with no real consequences; others ask what specific law was broken, distinguishing “crime” from “moral atrocity.”
- Extended side‑discussion speculates whether the U.S. might use nuclear weapons against Iran; most replies consider this extremely unlikely and label such fears as delusional or vastly overstated.
- Some argue current norms and institutional “safety walls” are eroding, while others see betting‑market odds and military culture as evidence against such scenarios.
- A few suggest any U.S. nuclear use would likely trigger rapid escalation elsewhere (e.g., against Ukraine), though this is purely speculative within the thread.
Skepticism about standard narratives
- A small minority questions aspects of the Hiroshima narrative, comparing aerial damage to conventional firebombing and citing claims about how casualties were attributed and destruction timelines framed.
- Others push back, reading these as implying nuclear weapons might not exist or might be overstated, and explicitly challenge that line of thought as puzzling or unsupported.