Coral reefs, sunken ships, fish, crustaceans. All this and much more can be seen and experienced through scuba diving. Most of the planet is comprised of seawater, and its depths hide surprises and places that are worth seeing first-hand.To get started in this sport, the best thing to do is practice in pools or shallow waters. Then , the possibilities grow as one learns more and improves their techniques. Bear in mind that the sea is a wild environment and thus, unpredictable. Being an expert and knowing this setting well does not free one from the obligation of meeting all the safety requirements and of terminating the dive in the event of a risk.Currently, this sport is practiced all over the world as breath-hold diving or with tanks of compressed air. However, in addition to being a sport, diving is necessary for conducting research at the bottom the sea and on the biodiversity that lives there.The wetsuit, mask, tube, fins and tanks are the essential elements, but there are others that can also be very useful, depending on where the diving is done. Today, thanks to technology (GPS, video cameras, computers, etc), diving can be done in different ways, such as night diving, entering caverns or diving under the ice.The technique, as well as knowing how to control time and consumption, having a support boat and controlling one’s breathing rhythm at all times are aspects that must be taken into account. A good way to prevent forgetting is to contact a specialised company. One such company is Manatee Diving, located in the port of Mataró (Barcelona). They give diving courses all year round. Another is Sa Caleta Diving Center (in Lloret de Mar, Girona) where "baptisms" and advanced courses are offered for all ages.