Upon arrival, the Navy team will start to plan the safe disposal of the ordnance, which was found 548 metres North East of the White Rock pier at St Peter Port Harbour.

A 200-metre maritime Exclusion Zone is in place around the device, as published in the Local Notices to Mariners on the Guernsey Harbours’ website.

Guernsey Coastguard is working with Bailiwick Law Enforcement to coordinate the operation to dispose of the device.

“Mariners should follow the instructions of the Local Notices to Mariners and not conduct underwater activities including anchoring, diving and dredging in the exclusion zone which has been established,” said Guernsey’s Harbourmaster Captain David Barker.

“Public safety must be our first concern and priority.”

A team of local divers discovered the ordnance during a routine dive in the area. It has lain on the seabed undisturbed for over 70 years.

At present, no commercial vessel traffic movements into St Peter Port or St Sampson’s harbours are expected to be impacted as result of its discovery.

Pictured top: A 200-metre Exclusion Zone has been established around the unexploded ordnance.