Published Friday, 27 April 2012
The sonar pictures which gave the illusion that a ship was in the Lough. (© UTV)
It had been thought that a small U-boat had been found under water close to the Foyle Bridge.
Less than two weeks ago, Environment Minister Alex Atwood said there could be a war grave and he advised divers to stay away from the wreck.
But Mr Attwood said sonic scans of the area have not "not confirmed the possibility of a submarine or other significant find".
"The original image that excited interest was the form of a 'sonic illusion'.
"When the site was scoped out the sonar exaggerated and enlarged what is there in the sweep around the site," he explained.
The possibility of a shipwreck or submarine at the bottom of Lough Foyle had peaked public interest, and the Minister said he too shares "a sense of disappointment".