Police and coastguard rescuers have launched a search for a teenager who went missing while snorkelling in the English Channel.
Oscar Montgomery, 17, was last seen diving off the coast of Church Ope Cove, a small sheltered beach on the Isle of Portland in Dorset.
The last confirmed sighting of the teenager was at about 5pm on Wednesday.
Portland is a tied island to the south of Weymouth and the southernmost point of Dorset.
Chief Inspector Lance Cliff said: "We are extremely concerned for Oscar and I am appealing to anyone who may have knowledge as to his whereabouts to please contact police immediately.
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“I would be keen to hear from anyone who was out in the water in the area and recalls seeing a diver matching the description given and may have information that could help us find Oscar.”
Officers have been carrying out searches, assisted by HM Coastguard, the RNLI, Dorset Search and Rescue and Dorset Police.
Three helicopters - from the Coastguard, the Royal Navy, and Dorset police - are involved in the search, along with several watercraft, HM Coastguard said.
A Dorset Police spokesperson said: "Officers searching for a teenage diver who went missing off the coast of Portland are appealing for help from the public to find him.
"Oscar Montgomery, aged 17, was diving off the coast of Church Ope Cove on Wednesday 27 May 2020.
"It is believed he was last seen at around 5pm.
"Oscar is described as white and of a slim muscular build with brown hair and a small slit in his left eyebrow.
"He was wearing a dark-coloured wetsuit with black flippers and a black snorkel."
Anyone with information or knowledge as to Oscar's whereabouts is asked to contact Dorset Police at www.dorset.police.uk, via email 101@dorset.pnn.police.uk or by calling 101, quoting incident number 27:492.
Alternatively they can contact Solent coastguard operations centre on 02392 552100.
