Tyne and Wear HER(13954): Sunderland, Vianna - Details
The steamship Vianna sank after being struck by a torpedo near Souter. The date of the sinking is recorded as 31st March 1918. The grid reference places the wreck off Ryhope and Seaham, not Souter.
Ian T. Spokes Wreck Database, Inga Project, National Monuments Record