There are few medical indications for this class of drug, and their abuse for non-medical reasons is incredibly foolish.
Used improperly, they can be quite dangerous to the liver, reproductive system & cardiovascular system. In addition, they can cause behavioral & mood abnormalities such as aggressivity & violence, depression, and even acute psychosis.
In an individual abusing anabolic steroids in the pursuit of body building, I'd say the primary limiting factor to scuba would be the lack of judgement & good sense implied therein.
Best regards.
DocVikingo