The 500 pound World War Two device was picked up during dredging work.
Cars Vandalised In Portsmouth
A 31 year old man has been arrested after 50 cars were damaged in around seven hours.
Several cars parked in Watts road, Turner road and Wingfield Street had their tyres slashed between midnight and 7am on Saturday morning.
Police have been patrolling the streets where the attacks took place.
The Force says they would like to speak to anyone who was in the area at the time and saw something suspicious.
Anyone with information or who wishes to report damage is being asked to call Hampshire Police on 101.
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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