"H.M.S. Thebus (Thetis)." Zeebrugge. [ASE label]
The H.M.S. Thetis was one of three British ships (along with the H.M.S. Iphigenia and the H.M.S. Intrepid) scuttled as blockships to limit German access to the Belgian port of Bruges-Zeebrugge during the raid of April 1918 by blocking the Bruges Canal. Though the H.M.S. Thetis was successfully sunk at the mouth of the canal, it would only remain blocked for a few days.