Sonar image of HMS Royal Oak (a Revenge Class Battleship)sunk at anchor in Scapa Flow in 1939 — More images at http://www.hmsroyaloak.co.uk/survey.html

In this scan you can see that the bows were blown off by torpedo hits. Other scans show massive damage to the starboard side also caused by torpedos.

posted by Incredible Sulk on pistonheads.com

Revenge-class battleship of the British Royal Navy. Launched in 1914 and completed in 1916, Royal Oak first saw action at the Battle of Jutland. In peacetime, she served in the Atlantic, Home and Mediterranean fleets, more than once coming under accidental attack.

The ship drew worldwide attention in 1928 when her senior officers were controversially court-martialled. Attempts to modernise Royal Oak throughout her 25-year career could not fix her fundamental lack of speed, and by the start of the Second World War, she was no longer suited to front-line duty.

On 14 October 1939, Royal Oak was anchored at Scapa Flow in Orkney, Scotland when she was torpedoed by the German submarine U-47. Of Royal Oak’s complement of 1,234 men and boys, 833 were killed that night or died later of their wounds.