Casco Antiguo Portugal is the Portuguese branch of Casco Antiguo Profesional, a Spanish-founded company with more than 40 years of experience supplying underwater technology equipment. Based in Coina (Barreiro), it serves professional, military, technical and recreational diving as well as oceanography, hydrography and search-and-rescue, offering equipment sales, maintenance and technical consultancy through a professional showroom. Alongside this equipment business, Casco Antiguo also runs a recreational dive school in Portugal, teaching courses such as Open Water Diver, Advanced Open Water Diver and Enriched Air (Nitrox). The company frames diving as more than a sport or profession, describing it as a way of life, and supports its training offering with equipment servicing, inspections and repairs for professional dive gear.