
Big Blue Diving
Big Blue Diving, Palmanova: SSI and PADI center founded 1997, operating year-round from two RIBs across SW Mallorca's El Toro marine reserve and surrounding sites.
Also known as: Conger Wrack, Congrios, Josephine MS, Josephine MS Wreck, Pecio de los Congrios, Pecios Congrios
Wreck remains at 33-36 m mid-channel between Sa Dragonera and Sant Elm, SW Mallorca, where large moray and conger eels fill what is left of the hull.
Last updated October 2026
The descent is a vertical drop through open water on the anchor line, with nothing to follow but the line itself. The wreck comes up out of the blue onto sand at 33 to 36 m, in the middle of the channel between Sa Dragonera and Sant Elm, and no part of the dive is shallower. Little of the hull survives, so the bottom stage is a slow pass along the remains before the line back up. Time at depth is short, and at this depth standard EANx32 sits at or past its maximum operating depth, so the gas plan is set before the boat leaves.
The eels are the reason for the dive and the reason for the name: Pecio Congrios means the wreck of the conger eels. Large morays and congers pack the remains, congers reaching about 2 m, with dusky groupers, common lobsters and scorpionfish around the hull. A worn wreck with little structure left asks for patience rather than penetration, and the eels settle into the gaps the hull has opened.
Boats for the Dragonera dives have worked from Sant Elm and Port d'Andratx. The strait is open to the weather and the site is dived on calm days. The wreck sits below the thermocline, so the bottom is 14 to 16 C even when the surface reaches 25 to 27 C: a 7 mm suit with a hood is the summer choice, and visibility runs 15 to 25 m. The anchor line is the sole reference on the way down and up, and losing it means a blue-water search at depth. Keep the line in view on both legs and carry a surface marker buoy.
What makes this dive site stand out.
Large eels packed into the wreck remains, the reason the site has its name.
Remains on sand in the strait between Sa Dragonera and Sant Elm.
A vertical open-water drop to 33-36 m, with no shallower part to the dive.
The strait is open to the weather and the site is dived in settled conditions.
39.5828°N, 2.3361°E
Advanced Open Water is our minimum because the whole dive lies below 18 m. One dive guide calls the wreck suitable only for advanced divers, and an older diver review of the Dragonera dives asks for Advanced Open Water or CMAS Silver and 25 logged dives.
Summary
A deep open-water descent on an anchor line, in a strait open to the weather.
Safety considerations
What can go wrong here, and what divers do about it. Conditions change - take the briefing from the operator on the day.
Book a guided dive at this site.

Big Blue Diving, Palmanova: SSI and PADI center founded 1997, operating year-round from two RIBs across SW Mallorca's El Toro marine reserve and surrounding sites.

SSI Instructor Training Center and PADI 5-Star at Port Adriano, SW Mallorca, founded 2011; boat access to El Toro reserve with fully published dive pricing.

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Diving here needs certification and accident insurance; course dives and dives an authorised centre runs that give no certification need no card.
That is the story one dive guide tells: a wooden boat called the Josephine MS collided with another vessel crossing the channel between Sant Elm and Dragonera and sank in 1993. A diver at a Sant Elm base named the MS Josephine among the Dragonera wrecks in 2012. The name, the date and the collision all come from that thin trail, so read them as local lore. Nothing is known of the vessel's builder, owner or route.
No. A 2008 dive report lists the Conger Wrack off Dragonera and a wreck at Punta Galinda as two separate dives. Pecio Congrios, the Conger Wrack of German-language divers, is the one in the middle of the channel between Sa Dragonera and Sant Elm. A cargo ship sunk as an artificial reef off Tarragona carries a near-identical name, La Dragonera, and is another wreck altogether.
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