Clube Náutico de Oficiais e Cadetes da Armada

Clube Náutico de Oficiais e Cadetes da Armada (CNOCA) is a private, non-profit sports club for Portuguese Navy officers and cadets, tracing its founding to an 1888 royal decree of King Carlos I under the name Club dos Aspirantes de Marinha; it took its current name in 1938, after an earlier 1927 change. It now serves around a thousand members across eight sports sections, from rowing and sailing to golf and spearfishing. Diving ("Mergulho") is one of them, based at the Alfeite Naval Base on the Tagus, in Almada across the river from Lisbon.

Unlike a purely internal club activity, the diving section completed its own licensing process with the IPDJ, Portugal's national sport and youth authority, as a diving school in its own right, and it is open to non-members and their families as well as to officers and cadets. It is affiliated with SSI, teaches the Open Water Diver course to 18 metres and a Junior Open Water Diver track for ages 10-11 to 12 metres, and offers Extended Range technical diving and freediving alongside the core recreational programme. The section's one named dive site is Roberto Ivens, a wreck near the mouth of the Tagus. Equipment rental and air/nitrox fills run through direct enquiry rather than a published price list.

CNOCA's diving section is not commercially marketed to the general tourist-diver public the way a harbour dive shop nearby is, and it carries no meaningful trail on the major review or community platforms that normally cover those operators. That gap fits its character more than it counts against it: a section run inside a club well over a century old, addressed first to its own officers, cadets and their families, even though the course itself is open to outsiders too. A diver used to picking a centre by star rating won't find one to check here; what stands in its place is the club's own long institutional history and its diving school's IPDJ licence.