Before diving Equipment must be checked thoroughly before diving. It must be fully operational and the cylinders must be filled.
Weights must be chosen beforehand. Before diving in an unfamiliar area, be sure to talk to those who have experience of diving in the area.
If you dive with an instructor, follow their instructions and recommendations clearly. Under water, do not climb into narrow caves and crevices. Do not touch unfamiliar fish species: they may be poisonous or have sharp fins that can injure you.