ALTAIR
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.
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
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.
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.
Nearest Dive Centres to ALTAIR
Dive shops near ALTAIR
Dive Newquay
Wavecrest Scuba
Harlyn Dive School
Scuba 2000
Karleyth Diving Ltd.
Seaways Diving
Reviews for ALTAIR
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)
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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