HS Koningin Regentes (Dutch pronunciation: [ˌkoːnɪˈŋɪn reːɣɛnˈtɛs]; "Queen Regent") was a Dutch hospital ship that was torpedoed by the Imperial German Navy submarine SM UB-107 on 6 June 1918 while returning to Rotterdam, the Netherlands, from Boston, Lincolnshire, England.

[2] The Koningin Regentes was used as a ferry boat between the Netherlands and the United Kingdom until the outbreak of World War I.

[citation needed] After World War I began, Koningin Regentes was refitted with special accommodations and repainted for service as a hospital ship.

When she was 21 miles (34 km) east of Leman lightship, she was torpedoed by the Imperial German Navy submarine SM UB-107 and sank shortly afterwards.

It lies close to an English drilling site, and the sea floor is level with only sand and shells; visibility is also very good.