52m
    Cornwall & Devon, United Kingdom
    Kelsey Head

    ALTAIR

    Best months: Jul–Sep

    Protected Area

    Kelsey Head

    Why dive here

    With 176+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - ALTAIR offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 176+ species recorded
    Water10-18°C · warmest July, August, September
    CharacterWreck dive · max 52m
    StandoutExceptional marine biodiversity

    The Altair, or what’s left of her, lies deep off the Cornish coast. We’ve always had a soft spot for deep, historical wrecks, and this old steamship, torpedoed in 1917, delivers a proper challenge. Dropping onto her deck at 52 metres, the sheer scale of the 79-metre hull becomes apparent, even if she’s broken in places. Visibility here can be tricky, often just a few metres, so a good light and excellent buoyancy are essential. What we love about the Altair is the raw history of it all. You can trace the lines of her two boilers, still largely intact, and imagine the compound expansion engine that once drove her single shaft. The metal work is draped in dead man’s fingers and bright orange cup corals, with conger eels peering from every crevice. Our favourite approach is a slow circumnavigation, taking in the bow and stern sections, then spending some time examining the engine room remains. It’s a dive for experienced deep divers, demanding careful planning and gas management, but the rewards are tangible – a quiet, powerful connection to a moment in time. Expect to share the space with inquisitive pollock and shoals of pouting darting through the superstructure.

    Typical ALTAIR Dive Profile

    15m30m45m60mSafety Stop0m52m max~15 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Safety Notes

    Maximum depth 52m exceeds recreational limits (40m). Technical diving certification and equipment required.

    Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

    Always perform a 3-minute safety stop at 5m before surfacing.

    Today06:3717:4011h 2m daylightGolden hour 16:55

    ALTAIR Wreck History

    Year Sunk

    1917

    Vessel Type

    cargo ship

    Cause

    torpedo

    Tonnage

    2,586 GRT

    The S.S. 'Altair' was a veteran of the seas, built in 1884 as the 'Hindustan' and sailing for over three decades before meeting a violent end during the height of World War I. On October 18, 1917, while steaming in ballast from Rouen, France, to Cardiff, Wales, she crossed paths with the German submarine UC-51. Without warning, a torpedo struck the unarmed steamship, sealing her fate. The 'Altair' sank quickly, becoming another casualty of the unrestricted submarine warfare that defined the era.

    Today, the 'Altair' lies at 52 meters in the English Channel, placing her firmly in the realm of technical diving. The depth and strong currents demand respect, experience, and proper gas planning. For those qualified to make the descent, the wreck is a magnificent time capsule. Divers can explore the remains of the 19th-century vessel, including her two large boilers and compound expansion engine, which stand proud on the seabed. The structure is a poignant reminder of the Great War's toll on merchant shipping, now serving as a challenging and rewarding deep dive site off the English coast.

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    Conditions

    Ocean conditions, forecast and tides for ALTAIR

    ALTAIR Ocean Conditions

    Monthly averages for ALTAIR, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    17°C

    62°F · Range: 15.1–17.5°C

    Air Temperature

    13°C

    56°F

    Wind Speed

    8.14 m/s

    15.8 knots

    Atmospheric Pressure

    1011 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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