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12. Behaviors to follow and avoid during diving
The non-respect of these instructions can expose you to dangers
leading to serious consequences on your health.
Preamble
The scuba diving is a risky activity if it's done without knowledge of safety
rules. You will find in this document the main tips to follow and avoid to make
your dives enjoyable leisure time. Other tips may be given by qualified diving
instructors.
Rules & basics advises
Prior to diving, it is highly advisable to consult your doctor to assess
your fitness to dive.
If you suffer from cardiovascular disease, asthma, diabetes, heart disease or
vascular, ENT diseases, epilepsy and other neurological disorders, scuba
diving practice is strongly discouraged. It also applies to transient diseases
such as colds, sinusitis, bronchitis, infection of the nose, throat, ears (otitis)
or teeth (caries).
Other factors must also make you give up scuba diving as peptic ulcer
disease, retinal detachment, glaucoma, enlarged spleen (splenomegaly) or
pregnancy.
You will find in Annex a (french) document of the FFESSM (French CMAS)
with a more complete list of contra-indications.
Do not fly and avoid ride in altitude the same day of diving.
Throughout the dive, you need to adopt a continuous breathing while
regularly checking your manometer gauge.
Do not use earplug, they prevent pressure equalization. Dive only if you feel
good and you feel like it, hydrate yourself before and after the dive (to avoid
drying up the mucous membranes with the cool and dry air)
The descent
The descent (even shallow) leads to an increase of the ambient pressure. To
maintain a level of equal pressure between you and the environment, you
have to do the maneuver of Valsalva. This process involves blowing (slowly)
while holding your nose pinched and your mouth shut. By performing this
operation you avoid the main risk during the descent : barotrauma, which
exerts its effects on the eardrums and sinuses mainly.
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