■Descent
At the time of descent, use the descent rope to gather at the target on the sea floor such as the team leader's strobe light, etc..
All divers of the diving teams should not dive at the same time, but dive in a fixed order.
If all dives at the same time in a night dive or poor visibility dive, the team leader will not be able to manage the safety of the entire team and it will be difficult to provide a safe and enjoyable dive.
Before landing on the sea floor, make sure there are no dangerous creatures such as diadema setosums and rays.
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