Diving in Costa del Maresme

The Costa del Maresme is Barcelona's everyday diving coast, a 25 km working strip between the city and the Costa Brava that most divers reach in twenty to thirty minutes by car. Its appeal is functional rather than iconic: leave central Barcelona at 07:30, dive two tanks by 11:00, and make lunch. Around twenty-five regularly dived sites split cleanly across two small ports, and the centres here serve a largely local, Catalan-speaking clientele rather than seasonal tourism.

The signature dive is El Santuari, a decommissioned offshore fish farm that was sunk in 2009 off Sant Andreu de Llavaneres and now sits as a metal skeleton between 13 and 26 m. Its upper walkways carry dense tunicate growth; the lower level holds white gorgonians, bryozoans, and a seasonal barracuda school working the outside of the structure. Access is exclusive through Posidonia Dive. The Port de Mataro rotation is built around Las Barras de Mataro, six parallel rocky bars running offshore from near the beach to about 30 m, with the sheltered cracks holding morays, congers, octopus, and lobsters. La Barreta de l'Arbre, El Sastre, El Triangle, and La Torre Ferrer are the staples of the Blaumar calendar. La Virgen, a rocky plain with a submerged Virgin of Carmen statue at around 7 m, is the area's all-levels entry and a staple for night dives. Advanced divers chase the Draga Grande and Draga Pequena dredger wrecks at around 15 to 34 m. The soft substrate between the bars carries Posidonia meadows designated under the Natura 2000 network, though the coast is not a marine reserve and no permits apply beyond the El Santuari concession fee.

Both dive hubs sit a short drive from the city. Port de Mataro hosts Blaumar and Mediterranean Dive; Port Balis at Sant Andreu de Llavaneres hosts Posidonia Dive. Rodalies lines R1 and RG1 run direct from Barcelona Sants and Placa Catalunya to Mataro in around 49 minutes, and Mediterranean Dive is a four-minute walk from the station. All diving is boat diving; typical briefings start around 08:00 or 10:00 with a 45 minute pre-departure arrival at the centre. Single dive plus tank at Blaumar runs 38 EUR on air or 44 EUR on Nitrox; two-tank outings are 71 or 83 EUR, and El Santuari carries a 5 EUR per diver concession fee. The coast dives year-round (Blaumar alone runs around 600 outings per season), but July to September is the overall sweet spot for the barracuda season at El Santuari and the densest boat schedules. Even in high summer, plan exposure suits for the 15 to 18 C bottom band rather than the 23 to 25 C surface.

Six parallel rocky bars (Las Barras de Mataro) running offshore from near the beach to around 30 m, remnants of older shorelines. Sandy bottoms between the bars carry Posidonia meadows, and artificial structures (the sunken fish farm, dredger wrecks) add vertical relief in otherwise low-relief zones.