Launched in 1918, the Bolzaneto was an Italian armed cargo steamship operated by Ilva of Genoa. Serving during a turbulent time in maritime history, her fate was sealed in June 1943, when she was struck by two torpedoes from a British submarine off the coast of Bonassola.
The attack claimed the lives of 10 crew members, including Commander Giuseppe Mazzei, and sent the ship to the seabed, where she remains to this day—a haunting and fascinating site for experienced divers.
Wreck Overview
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Type: Armed cargo steamship
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Launched: 1918
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Sunk: June 1943
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Depth: Approx. 55 m
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Condition: Broken in two main sections
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Access: Boat dive (technical level)
Dive Highlights
The Bolzaneto now lies at -55 metres, broken into two main sections. The stern rests in the sand near the cargo holds, where divers can admire the large propeller and intact rudder blade—both still clearly visible and remarkably preserved.
Mounted on the deck is a single-barrelled stern gun, surrounded by rudder control chains. This section allows for limited penetration: below the gun mount, divers can explore a small room containing ammunition and the remains of the on-board workshop, complete with scattered tools.
At the wreck’s midpoint, the base of the funnel is still distinguishable, and on either side of the central structure are two smaller cargo holds that provide access to the engine room. From here, it’s possible to glimpse additional spaces such as the kitchen, now silent and half-buried in silt.
As you move forward along the wreck, the bow section gradually disappears into the mud, shrouding much of it from view.
Marine Life
The wreck is a haven for marine biodiversity. Inside the holds and among the debris, you’re likely to encounter conger eels, lobsters, and spiny lobsters, using the shadows of the wreck as shelter.
The exterior is adorned with jewel anemones, adding bursts of vivid colour around the gun and hull. Shoals of damselfish and silversides swirl in the water, attracting larger predators such as snapper, amberjack, and bonito—making for a dramatic and lively dive.
