Deep diving specialty Certification card Equipment 1 Equipment 2 Equipment 3 Equipment 4 Prevention for decompression sickness 1 Prevention for decompression sickness 2 Prevention for decompression sickness 3 Symptoms of decompression sickness Treatment for decompression sickness Prevention for Nitrogen Narcosis Treatment for Nitrogen Narcosis Plans and rules Changes in air consumption rate Calculation of dive time limit Depth limit Boat support Diving preparation Descent Underwater action Ascent and exit Emergency action
Immediately before and after the dive, drink enough water to keep your blood smooth.
Sports drinks are perfect
Avoid powerful exercise during and immediately after dive.
Move slowly in the water！
Let's dive so that the dive time does not exceed the No-decompression Dive Limit.
Safety stop is recommended strongly.
Keep your ascent speed.
Do not forget safety stop！
Never fast ascent speed
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