The 500 pound World War Two device was picked up during dredging work.
CCTV Released After Serious Attack
Detectives in Bournemouth investigating a serious assault outside a fast food takeaway shop in the town centre have released a CCTV image of a man they wish to speak with.
An 18-year-old man from Poole was attacked by two unknown men outside Snappy Tomato Pizza on Exeter Road at around 4.05am on Friday 14 December 2012.
The victim suffered a fractured jaw after being punched in the face.
Detective Constable Caroline Craft, of Bournemouth CID, said: "The victim had been on a night out when he was subjected to this unprovoked attack.
"His injuries were so severe he required surgery in hospital.
"Following further enquiries, I am now able to release two CCTV images of a man we believe could hold vital information that could help us with our investigation.
"I am continuing to appeal to anyone who witnessed this assault, and anyone with any information about this incident, to contact us, in confidence, as soon as possible."
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 14:373. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.
640 men were killed when the South African troop carrier was hit by a cargo ship in 1917.
The 79-year-old man suffered a serious head injury in the Cranmer Road car park in Winton.
Two Girls Indecently Assaulted Last Sunday
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