On 7 May 1915, the ocean liner RMS Lusitania was sunk by a German U-boat off the coast of Ireland with more than half the passengers and crew being killed. Some of those lost were Americans and the sinking hardened opinion in the United States against Germany and marked the beginning of the process which led to the USA entering the First World War on the side of the allies. To mark the anniversary of the sinking Stephen Payne joins the podcast. Stephen is a British naval architect and worked on designing passenger ships for over 40 years and is an expert both in their construction and their history. He and Dan discuss the circumstances of the sinking, whether there was any justification for it and the effect it had on public opinion and naval policy.