The 500 pound World War Two device was picked up during dredging work.
Robbery at Sandbanks Building Site
Police in Poole are appealing for witnesses and anyone with information to come forward after a burglary in the Sandbanks area.
The incident, in which unknown offenders forced entry to a container on a building site in the Arlington Road area and stole power tools, happened between 5pm on Thursday 24 November 2011 and 7.30am on Friday 25 November 2011.
Police Constable Laura Prowse, of Poole police, said: “Items stolen include drills and measuring tools.
“Among the tools are two red Paslode spit guns worth £350 each, a Makita hammer drill, a Makita radio, two Makita SDS drills, a Makita battery charger, two Dewalt cordless drills worth £200 each and a Dewalt laser level worth over £170.
“Two white men, one wearing rigger-type boots and baggy trousers, were seen in the area at the time and I am very keen to talk to them.
“Also, I am appealing for anyone who witnessed this burglary, and anyone with any information about those responsible, to contact police as soon as possible.
“I would also like to speak to anyone who has been offered tools in unusual circumstances or for an unusually low price.”
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 25:72. 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
Recently Played Tracks
Now playing: Non-stop hit music
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Find out more about some of the companies advertising on Heart.
Get some great ideas on how to advertise your business on radio, online and on mobile.