Two divers are missing, and presumed dead, after failing to return from a dive on the artificial reef HMS Scylla in Cornwall.
A third diver who managed to surface is currently undergoing treatment for DCI at the DDRC in Plymouth.
The trio were diving on the Leander-class frigate in Whitsand Bay, which was sunk in 2004 as a dive attraction and marine habitat, in the late afternoon/early evening of Friday 3 September.
The alarm was raised to HM Coastguard at 7.45pm, and a major search operation involving the RNLI vessels from Plymouth and Looe, a S&R helicopter from Newquay, and Devon and Cornwall Police was conducted into the early hours of Saturday 4 September.
James Instance from Falmouth Coastguard said the pair were suspected to have died, but that had not been confirmed.
Devon and Cornwall Police said: “Police are currently assessing the situation and next of kin have been informed.”
Divers have been asked to steer clear of the shipwreck for the time being.