21 Heavy Shells Failed to Sink This Monster

In January 1915, the German battlecruiser SMS Seydlitz came within moments of exploding after a British shell ignited propellant fires that raced toward her magazines. Saved only by the desperate actions of Pumpenmeister Wilhelm Heidkamp, who burned his hands opening red-hot flooding valves, the ship survived what should have been a fatal hit. Rather than dismiss the disaster as bad luck, the German Navy completely overhauled its ammunition-handling procedures, introducing anti-flash measures and strict magazine discipline that would soon prove decisive. At the Battle of Jutland, Seydlitz endured one of the most punishing bombardments ever survived by a capital ship, absorbing heavy shellfire, turret fires, and a torpedo strike while helping destroy HMS Queen Mary. Crippled, flooding, and barely afloat, she spent three days crawling back to Germany as her exhausted crew fought the sea with portable pumps and improvised repairs. This is the extraordinary story of SMS Seydlitz, the battlecruiser that survived when countless others would have vanished beneath the waves, and how one near-catastrophe forever changed naval warfare. -- As images and footage of actual events are not always available, Dark Seas sometimes utilizes similar historical images and footage for dramatic effect. I do my 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 corrections, additional information, or new ideas.