Had a bit of a poke around and found this, an extract from a National Paper;
22 December 2006
GOT U!
Three wrecked Nazi subs reveal success of secret British mine trap
By Richard Smith
THE discovery of three Nazi U-boat wrecks has shed light on a deadly British minefield trap that remained secret for 60 years.
Divers found the remains of the Second World War vessels all lying close to each other seven miles off Newquay in Cornwall, where no U-boats had ever been recorded as being lost.
But using de-classified wartime documents, historians revealed they were victims of a deep minefield laid to defend supply lines.
The secret project was sparked when a U-boat commander sunk a British destroyer after finding a gap in a minefield protecting supply ships heading to Cardiff and Bristol between Cornwall and Ireland.
He radioed the news to Germany but the message was intercepted by British intelligence.
The deep mines were laid to allow surface ships through safely while destroying the deadly U-boats.
Naval historian Eric Grove said the fate of the U-325, U-400 and U- 1021, which disappeared in late 1944 and early 1945, shows just how successful the trap was.