This Only Happened Once in All of WW2

Dark Seas May 5, 2025
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Business Inquiries: [email protected] Join Dark Seas as we explore the world of naval warfare with cinematic short documentaries featuring the most powerful ships ever built, top-secret military projects, and classified missions. Including US, UK, Japanese and Soviet ships and battles from World War I, World War 2, the Korean War, the Vietnam War, the Cold War, and the Gulf War. As images and footage of actual events are not always available, Dark Seas sometimes utilizes similar historical images and footage for dramatic effect and soundtracks for emotional impact. We do our best to keep it as visually accurate as possible. All content on Dark Seas is researched, produced, and presented in historical context for educational purposes. We are history enthusiasts and are not always experts in some areas, so please don't hesitate to reach out to us with questions, corrections, additional information, or new ideas at [email protected].

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German cannon fire tears into HMS Seal as she wallows in the narrow Kattegat Strait between Denmark and Sweden. British Lieutenant Commander Rupert Lonsdale stands rigid on the bridge, watching his submarine disintegrate around him. His Lewis guns, the vessel's only protection on the surface, jam one after another. Above, Kriegsmarine Arado seaplanes bank and circle back for another pass, their silhouettes stark against the dawn sky of May 1940. Lonsdale is trapped… but he knows that below deck lurks a deadlier threat. In Seal's flooded bilges two depth charges secretly wait, primed to explode if the submarine sinks past fifty feet. As fresh German fire punctures the hull and seawater floods in, Lonsdale contemplates doing something unthinkable - something that will happen only exactly once in the entire war.

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