Flags on sunken naval vessels

The wreck of the 'Royal Oak' is now an official war grave and there is an annual commemoration service. Royal Navy divers go down to the ship and raise a White Ensign in memory of the 833 crew killed.
André Coutanche, 15 August 2005

http://www.navweaps.com/index_inro/INRO_Repulse.htm recounts the loss of warships Repulse and Prince of Wales but also shows, as the second photo on that page, a flag under water.

Caption: "The White Ensign attached to the port inner shaft of the HMS Repulse, ninety feet (30 m) down in the South China Sea."
Jan Mertens, 12 August 2005

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The flagpole is attached to the (wreck of the) USS Arizona herself, whereas the Memorial is shaped like a bridge, touching neither the wreck nor the flagpole.
Miles Li, 17 August 2005