The diver, reported to be a man in his forties, was thought to have been diving at depth of about 14m last Saturday when his SMB line got knotted around the pot lines.

As the fishermen pulled in their pots, the diver was hauled upward by his own SMB line and forced into a rapid ascent.

Recovered into his dive boat and showing signs of DCI, the diver was airlifted by the Coastguard's Portland helicopter to the chamber in Poole, accompanied by his female buddy who had ascended normally.

Thankfully, after treatment he was deemed well enough to be discharged.