Germans Sink Titanic’s Sister Ship in WW1 – The Sinking Of The Britannic 1916 June 30, 2023 Nicola History, Military History History Documentaries On the 21st November 1916, HMHS Britannic, sister ship to The Titanic, was sunk by a mine in the Aegean Sea. Credit The History Chap Please support our Sponsors - Or Buy an Item from our Catalog