The tanker SS Prudentia, built in 1889, sank following a collision with SS Hermione, which was lying alongside, between the islands of Fara and Flotta.
However, Whittaker (1998) says the Prudentia dragged her anchor in a gale and struck HMS Iron Duke.
She was owned at the time of loss by JM Lennard & Sons and was employed as an Admiralty oiler (Dictionary of Disasters at Sea, Wrecks of Scapa Flow).
In 1975 she was reported to be leaking oil and the least depth to be 12.1 metres. She is lying on her port side (UKHO, 1995).
- Nationality: British
- Date built: 1889
- Type: Steam tanker
- Builder: Palmers Co Ltd, Newcastle-upon-Tyne
- Purpose: Transport
- Length: 312.0ft (95m)
- Beam: 40.2 (12.25m)
- Draught: 19.8ft (3.2m)
- Cause Lost: Sunk after being holed by propeller of SS Hermione
- Date lost: 12 January 1916
- Registration: Middlesbrough
- Engine: Triple-expansion engine