Great Northern Wreck
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Off Stone Town lies Zanzibar's accessible piece of maritime history: the Great Northern, a British cable-laying ship wrecked at the start of the twentieth century, now a low, broken sprawl of ribs, plates, boilers, and chain settling into the sand. At barely more than ten meters, it works for every certification level and long bottom times, and the structure has become a magnet in otherwise plain surroundings — lionfish and morays in the machinery, snapper and sweepers schooling through the frames, octopus and nudibranchs for the patient. Visibility is harbor-honest rather than oceanic. History and ease, not drama, are the draw.
The moment you come for: Century-old cable-ship remains at friendly depth near Stone Town
Topography: Scattered, coral-encrusted remains of a cable ship lost in 1902 on shallow sand and rubble
Current: Sheltered water off Stone Town; tidal flow is modest and visibility varies with the harbor.
Know before you splash
Hazards: Harbor boat traffic and reduced visibility after rain.
Conservation: Artifacts belong on the seabed; the wreck has already lost most of its loose fittings.
Who you'll meet
Common Reef (Day) Octopus
Giant Moray Eel
Lionfish
Nudibranchs
For photographers
Wide angle: ★★★☆☆ · Macro: ★★★☆☆ — editors' 1–5 rating of what this site gives each style of shooting