Video & picture credit: Mark Milburn/Atlantic Scuba
The Royal Navy Explosives Ordnance Disposal (EOD) team were deployed to Maenporth Beach to investigate reports of a suspected parachute mine 800 metres offshore.
At around 9.30am on Wednesday, HM Coastguard Operations Centre at Falmouth received an emergency call from diver Mark Milburn after he discovered what he thought was a mine.
HM Coastguard sent the photographs to the Royal Navy EOD team based in Plymouth.
The pictures were taken by Mark Milburn who, when asked what his reaction to finding the bomb was, said:
"Oh, another bomb."
Mark, a professional diver at Atlantic Scuba, has found three previous bombs including a 2000lb bomb.
He said: "After surfacing I thought, I need photos for the EOD team for them to decide what it was."
Parachute mines were mostly used in the Second World War by the Luftwaffe and the RAF.
They were naval mines that were dropped from aircraft by parachute.
Falmouth Coastguard Rescue Team and the Falmouth RNLI were sent to the location to keep vessels clear of the area.
Mark Rodaway OBE, Duty Commander for HM Coastguard said:
"We won’t know exactly what we are dealing with until the EOD team make their way to the device."
He said: "Until that time, we have taken measures to clear the area and make sure that vessels and the public are kept safe.
"We are appealing to people to keep at a safe distance until it has been declared safe by the EOD team.
"We have no further information at this time but will hopefully provide an update after the EOD team have fully assessed the situation."