Cabo Tiñoso (La Azohía, Isla Plana & Puerto de Mazarrón)

Diving is boat work from three adjoining towns. Rivemar, open since 1984, and The Blue Jump run out of La Azohía, the latter listing 13 dive points inside the reserve; Divergente keeps a rigid 8 m catamaran and a semi-rigid at Isla Plana; and Buceo Hispania, active since 1993, runs from Puerto de Mazarrón to more than 20 points across Mazarrón Bay and the reserve. The 2016 regional decree splits the reserve's interior waters into cells, barring professional fishing in one and recreational fishing in three; the 2017 state order makes the outer band, out to the 50 m isobath, an integral reserve open only to authorised science. Each centre adds a reserve tax per dive on top of the boat.

The ground is rock over posidonia. El Corralón is a rocky wall with a bottom full of Posidonia oceanica, and the reserve's own habitat description adds coralligenous communities and photophilic algae. Bajo de Emilio is the bajo Buceo Hispania names among its regular grounds, and the minesweeper Nalón was sunk deliberately as an artificial reef, lying on mud from 28 m at the bow to 36 m at the stern. El Arco is a rock arch big enough for boats to pass through, dived at about 20 m. Bajo de las Palomas, a pinnacle rising from a sandy 42 m bottom to a 10 m top, sits some 11 km east of La Azohía on the Bahía de Cartagena stretch rather than inside the reserve itself.

It suits divers who want variety on a short boat ride. Coves carry the easy days and the courses, Cala Cerrada at 10–30 m sheltered from wind and swell, Isla de Paco and Cala del Faro at 4–15 m, while the deeper bajos and the Dragaminas take the second dive of the day. Cueva del Agua is not part of that: more than 3 km of hypogenic passage wrapped in a silt that lifts at a touch, held at a constant 29 °C against a 21 °C surface layer, and for trained cave divers only. Anyone after big dusky groupers on deep, current-swept seamounts should dive Cabo de Palos instead.