The Ship

RMS Lusitania was, at her launch in 1906, the largest and fastest ship in the world. Built by John Brown & Company on the Clyde for the Cunard Line, she and her sister Mauretania represented Britain's answer to the German speed supremacy of the early 1900s — funded in part by a British government loan, with the understanding that both ships could be requisitioned as armed merchant cruisers in wartime. She was 787 feet long, capable of over 25 knots, and could carry more than 2,000 passengers across the Atlantic in under five days.

By the spring of 1915, she was still making regular commercial crossings between Liverpool and New York, even as the war in Europe consumed millions of lives.

The Final Voyage

Lusitania departed New York on May 1, 1915, with 1,959 passengers and crew aboard. The German embassy in Washington had placed newspaper advertisements warning that ships flying the flag of Britain or her allies were liable to destruction in the war zone around the British Isles. Most passengers dismissed the warning. The Lusitania was fast — faster, many assumed, than any submarine could track or torpedo.

On the afternoon of May 7, as she approached the southern Irish coast near the Old Head of Kinsale, U-20, commanded by Kapitänleutnant Walther Schwieger, fired a single torpedo. It struck the starboard side just below the bridge. A second, larger explosion followed almost immediately — its cause debated by historians to this day. Within 18 minutes, the Lusitania was gone.

The Death Toll and Rescue

Of the 1,959 aboard, only 761 survived. The speed of the sinking — faster even than the Titanic — meant that most lifeboats could not be properly launched. The ship listed heavily to starboard, making boats on the port side impossible to lower. Many passengers jumped into the water and drowned in the cold sea or were struck by debris.

1,198 people died, including 128 American citizens. The loss of American lives would prove to have profound political consequences.

Controversy: What Caused the Second Explosion?

The debate over the second explosion has never been fully resolved. Theories include:

  • Munitions ignition — Lusitania's cargo included a consignment of rifle ammunition and artillery shells. Some historians argue contraband munitions contributed to the secondary blast.
  • Coal dust explosion — nearly empty coal bunkers may have contained explosive dust clouds ignited by the torpedo strike.
  • Steam boiler failure — damage to the boiler rooms may have caused a catastrophic steam explosion.

British and American authorities long maintained that the cargo was entirely legal. Declassified documents and subsequent diving surveys have added nuance but not a definitive answer.

Political Fallout and the Road to American Entry

The sinking caused outrage in the United States. President Woodrow Wilson demanded explanations from Berlin. Germany initially defended the sinking on the grounds that Lusitania was carrying contraband and had been warned. The backlash was severe enough that Germany eventually pledged to restrict unrestricted submarine warfare — a pledge it would abandon in 1917, directly triggering America's entry into the war.

The Lusitania's sinking did not by itself bring America into the First World War, but it fundamentally shifted American public opinion and established a pattern of German actions that made eventual U.S. involvement almost inevitable.

The Wreck Today

The wreck of Lusitania lies in approximately 93 metres of water off the Kinsale coast, and has been extensively explored by divers. It is protected as a controlled site under Irish law. The wreck has collapsed significantly over the decades and is now deeply encrusted with marine growth, a haunting memorial to one of history's most consequential maritime disasters.