Published Thursday, 12 April 2012
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The suspected submarine was revealed during the sonar search of the water, as teams searched for a person who had fallen into the water.
Instead, Mr Attwood said they found "what appears to be a submarine or a ship lying in relatively low water on Lough Foyle".
Londonderry was used as a naval base during World War Two and the Minister said the boat could be a war grave.
"Stay away from it," he urged.
"There may be munitions on it for all that we know. There may be bodies on board."
Mr Attwood said an assessment was being carried out to determine why and how long the vessel has been in the lough.
"It is unusual that there appears to be no record of the circumstances behind this situation.
"I have also asked that all agencies continue to work with DoE and the harbour commissioner to create certainty about the identity of and the reason why the submarine/boat is in the current location."