🚢 RMS Olympic & HMHS Britannic Launch – The Birth of Two Titanic Sister Ships Did You Know? 🧐 This rare historic footage shows the launch of two Olympic-class sister ships built at Harland & Wolff, Belfast — RMS Olympic and HMHS Britannic. ⚓ RMS Olympic was launched on October 20, 1910, and went on to become the longest-serving sister ship of the trio. ⚓ HMHS Britannic, the youngest sister ship, was launched on February 26, 1914. She was later converted into a hospital ship during World War I