A Brixton man has died while on a recreational diving trip off the coast of Norfolk.
Police say 49-year-old Christopher Vanstone may have surfaced too quickly, and are examining his diving equipment.
A second man was treated in hospital after the incident, which happened on Friday afternoon.
Police met the “recreational” diving boat as it returned to Hamilton Docks in Lowestoft, Suffolk.
A spokesperson said: “As is standard procedure the death is currently being treated as unexplained pending the outcome of the post-mortem examination.
“These are preliminary inquiries, but at this stage there do not appear to be any suspicious circumstances.”