Two sisters from Sussex have finally won the right for the wreck of their father's World War II ship to be classed as an official war grave.
Divers will now be prohibited from touching or entering the wreck
The Ministry of Defence (MoD) has agreed to grant the SS Storaa, which was torpedoed off the Hastings coast in 1943, full military protection.
Rosemary Fogg and Valerie Ledgard, from Worthing, won a court case and then an appeal in 2006 to protect the vessel.
But the MoD had been taking advice about the ownership of the wreck.
The women are the daughters of Petty Officer James Varndell, who died with 21 others when the merchant ship SS Storaa was torpedoed during WWII.
'Look not touch'
They argued in court that the ship should be classed as a war grave because it was on military duties when it sank.
James Varndell's daughters led the war grave campaign
Mrs Ledgard welcomed the decision, saying: "It's not a complete forgotten scene, someone will actually write down properly that the SS Storaa is a war grave."
Derek Twigg, Under Secretary of State for Defence, said: "Following the ruling by the Court of Appeal in October last year... the MoD reconsidered its stance regarding the designation of SS Storaa as a war grave.
"We have now agreed to designate the wreck as a protected place under the act.
"The wreck will be protected from unauthorised interference by divers who will only be allowed to dive on a 'look but don't touch or enter' basis once designated, any physical interference with the wreck would require prior licensing by MoD."
The SS Storaa was attacked by German E-boats as it transported steel in convoy to a weapons factory in Cardiff.