I was at an inquest a few years ago, not long after the Excel Bridge opened. A boy was out with his friends and jumped off the bridge on a hot May day. Although he could swim, he got into trouble, his friends jumped in to save him (nearly drowning themselves) but sadly he drowned. It seemed that the water below the surface was exceedingly cold, he'd gone down quite a way before he surfaced and he probably cramped. The coroner returned an inquest of accidental death.