Traveling back from a winter in Europe, mostly spent at Cape Martin in southern France, Isidor and his wife were passengers on the RMS Titanic when, at about 11:40 p.m. on April 14, 1912, it hit an iceberg. Once it was clear the Titanic was sinking, Ida refused to leave Isidor and would not get into a lifeboat without him. Although Isidor was offered a seat in a lifeboat to accompany Ida, he refused seating while there were still women and children aboard and refused to be made an exception. According to friend and Titanic survivor Colonel Archibald Gracie IV, upon seeing that Ida was refusing to leave her husband, he offered to ask a deck officer if Isidor and Ida could both enter a lifeboat together. Isidor was reported to have told Colonel Gracie in a firm tone: "I will not go before the other men." Ida insisted her newly hired English maid, Ellen Bird, get into lifeboat #8. She gave Ellen her fur coat, stating she would not be needing it. Ida is reported to have said, "I will not be separated from my husband. As we have lived, so will we die, together." Isidor and Ida were last seen on deck arm in arm. Eyewitnesses described the scene as a "most remarkable exhibition of love and devotion".