When I first learnt to dive I was taught to turn the tank valve on all the way, then a quarter turn back. I didn’t ask why at the time and yet many years later I found myself telling my students the same thing. Never once did anyone ask me why and I proceeded as

You may have noticed that whilst you are diving with us,we at H2O bang on about the importance of drinking… water! But why? Simply put, dehydration can make you more likely to get decompression sickness (DCS), aka ‘the bends’. According to DAN (Divers Alert Network) in over 70% of cases of DCS, the primary factor