How Nazi Engineers Built and Failed the V3 Supergun (And the Secret American Revival)

How Nazi Engineers Built and Failed the V3 Supergun (And the Secret American Revival)
In 1944, Nazi Germany unveiled one of its most ambitious and terrifying secret weapons — the V3 “supergun.” Hidden deep beneath northern France, this massive cannon was engineered to fire 140-kilogram shells across the English Channel, threatening to obliterate London in minutes. Designed with a revolutionary multi-charge barrel system, the weapon represented a desperate attempt by the Reich to regain control as the Allies closed in.
The project’s mastermind, engineer August Cönders, oversaw enormous underground facilities at Mimoyecques, built with forced labor under brutal conditions. Nazi propaganda touted the V3 as the weapon that would turn the tide of the war — but the reality was far darker. Technical failures, design flaws, and the relentless advance of Allied intelligence turned this superweapon into a tragic symbol of the Reich’s collapse.
In Operation Crossbow, the Allies launched daring bombing raids using Barnes Wallis’s Tallboy bombs, striking the V3 site with precision and burying the weapon before it could ever fire on London. What they discovered later was chilling — a massive subterranean complex that revealed the true scale of Hitler’s obsession with “wonder weapons.”

This story exposes how technological ambition, propaganda, and human suffering intertwined in the Nazi war machine’s final days — and how Allied intelligence and innovation prevented one of history’s greatest cities from destruction.

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Chapters:
0:00 – Introduction: London in 1944
1:45 – The Concept of the V-3 Supergun
4:30 – Multi-Charge Principle Explained
6:50 – Germany’s Engineering Ambition
9:15 – Forced Labor and Human Cost
11:40 – Allied Intelligence and Operation Crossbow
14:20 – Barnes Wallis & the Tallboy Bombs
16:50 – Destruction of Mimoyecques
18:15 – Legacy and Lessons of the V-3
19:00 – Conclusion: Why London Survived