Coastguard: Every Second Counts S03E08 - Episode 8

In the Irish Sea, a skipper alerts the Coastguard to a medical emergency - a deteriorating scuba diver who seems to be suffering from decompression sickness. The Maritime and Coastguard Agency's Survey and Inspection team conduct unannounced inspections of boats on the River Thames in London. Also, there's a 14-year-old who is having difficulty breathing in Snowdonia, Eryri National Park.