Just like bikes, there's risk involved. Take some courses & get good equipment & take good care of it. Baby steps; don't do a 150' wreck dive on your first time out. And if you're not in shape, attempting to get into a full wetsuit will really, really motivate you. Oh yes, and never, ever use rechargeable batteries in your dive light. Unless, of course, you enjoy the feeling of total sensory deprivation in 50' of water...