Commercial diving--tougher than it looks? Andrew Younghusband delves into the treacherous job of commercial diving, trying to master the qualifying exam after just four days training. Will he resurface victorious or will it be a nosedive?

Commercial diving--tougher than it looks? Andrew Younghusband delves into the treacherous job of commercial diving, trying to master the qualifying exam after just four days training. Will he resurface victorious or will it be a nosedive?