Distinctions in diving are made between moving underwater with and without artificial aids, and in the case of the former, between equipment that provides propulsion and equipment that does not.
1. Freediving
In freediving, divers hold their breath and rely on this reservoir of air while underwater. From Antiquity, the technique was widespread in the Mediterranean among sponge, coral, and pearl divers, as well as in salvage of sunken ships' cargos and in war [5. 524–526]. In the course of the European ex…