There are some precautions and preparations that should be taken before diving, whether you are experienced or a beginner.
Never go diving too soon after or before flying. The change in atmospheric pressure can cause "The Bends" either underwater or in the air, so divers should always consult an instructor to time diving and training to flight schedules.
Never dive after a heavy meal. The blood flows to the stomach to aid digestion and may cause cramp.
Never consume alcohol before diving (including the night before). The underwater effect of alcohol is multiplied many times, leading to disorientation and lack of judgment.
If a heavy smoker, cut down before beginning to dive.
Never go diving alone.
Always follow safety procedures as advised by the instructor.
If a diver has experience but has not been diving for a while (six months or more), they should tell the instructor and ask for a quick refresher course on procedures, safety and practices.
Look for PADI certified dive shops only. Ask around at the resort to see who is recommended. Don't take the first option or the cheapest (necessarily).
If sure to dive before leaving on a trip, access the official PADI site at Padi.com and look for PADI certified dive shops at the destination.
Read as much as possible about the destination. If experienced, a diver should know about the best dive sites before they even get to a resort.
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