Holbourn was a second-class passenger on the on her last voyage in May 1915. During the voyage, Holbourn befriended 12-year-old
Avis Dolphin, who was being escorted to school and family in England by two nurses, Hilda Ellis and Sarah Smith. With his insights into the largely hushed-up events surrounding the wreck of the
RMS Oceanic on 8 September 1914 off
Foula, Professor Holbourn was aware of the dangers presented to
ocean liners during the
First World War, and as a passenger on
Lusitania was prepared to face the worst. Holbourn attempted to insist that Captain William Thomas Turner should take the precautions of ordering
lifeboat drills and instructing passengers on how to wear
lifejackets. His efforts to stimulate safety awareness during a time of war were unwelcome, and he was asked to keep quiet. When the
ship was torpedoed by an
Imperial German Navy U-boat during the
First World War on 7 May 1915, Holbourn guided
Avis Dolphin and her nurses to his cabin where he fitted them with life belts, even offering up his own; he then steered them through the tilting passageways to the decks above and into a
lifeboat. This lifeboat capsized while being lowered into the water. Dolphin was saved, though her nurses were not. Holbourn himself dived into the ocean to find himself surrounded by a mass of bodies and wreckage. His hope of reaching the nearest boat was interrupted when he stopped to help a man who was floating helplessly nearby. By the time Holbourn found his way to a boat, the man he had pulled along with him was dead. Holbourn was picked up by the fishing boat
Wanderer of Peel and later transferred to the
Stormcock. He was one of over 750 rescued from the
Lusitania to arrive at
Queenstown in Ireland that night. ==Writings==