When to not scuba dive?
Respiratory and cardiovascular systems should be in good shape. All body airspaces must be normal and healthy. A person with heart trouble, a current cold or congestion or who has epilepsy, asthma, a serious medical problem, or who is under the influence of alcohol or drugs, should not dive. A person with heart trouble, a current cold or congestion or who has epilepsy, asthma, a serious medical problem, or who is under the influence of alcohol or drugs, should not dive.
What is the 120 rule in scuba diving?
Here’s how it works: Your max depth (in feet) + your bottom time (in minutes) should be less than or equal to 120. That’s it. So if you plan to dive to 60 feet, the rule says you shouldn’t stay down longer than 60 minutes. Why the 40 ft Limit. This is the depth for absolute beginners such as Discover Scuba Divers and Open Water students on dives 1 and 2. At this depth the NDL limit is over 2 hours, a new diver will use a tank of air in about 40 minutes at this depth.