ST CROIX
Protected Area
Bristol Channel Approaches / Dynesfeydd Mor Hafren
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) - ST CROIX offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.
The ST CROIX, a steamship torpedoed in 1917, rests at 43 meters off the Cornish coast. Dropping onto the wreck, you'll find her largely broken up, but sections of hull and machinery are still discernible, creating interesting swim-throughs for those with the right training. Schools of pollack dart between the twisted metal, and we often spot conger eels tucked into the darker recesses. It’s a dive for experienced wreck enthusiasts, a proper deep technical outing that rewards careful navigation and a keen eye for history, especially given its wartime story. Just remember that Cornish currents can be feisty here, so pick your slack water window carefully.
Typical ST CROIX 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 43m 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.
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Conditions
Ocean conditions, forecast and tides for ST CROIX
ST CROIX Ocean Conditions
Monthly averages for ST CROIX, 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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