HMSM SIDON
Protected Area
Chesil Beach and Stennis Ledges
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) - HMSM SIDON offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.
The HMSM SIDON is one of those wrecks that really sticks with you, a submarine with a bit of a tragic story. She went down after an accidental torpedo explosion, then was raised, only to be scuttled later as an anti-submarine target. Resting upright at 33 metres, she’s largely intact, which means plenty of scope for exploration. We love the way she sits on the seabed, her conning tower still defiant. As you descend, the dark shape slowly resolves itself, and you can make out the torpedo tubes and even the propeller. The interior is generally safe to penetrate for experienced wreck divers, offering a glimpse into her operational spaces. We’ve seen conger eels coiled up in the nooks and crannies, and huge spider crabs scuttling across the deck plates. Visibility can be a challenge here, often dipping, so a good torch is essential, and we'd always recommend timing your dive for slack water to avoid strong currents. It's a deep dive, and the conditions demand respect, but for those who love their history and a proper wreck, the SIDON is a rewarding experience.
Typical HMSM SIDON Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Deep dive (33m) - monitor air consumption closely. Advanced certification recommended.
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.
Nearest Dive Centres to HMSM SIDON
Dive shops near HMSM SIDON
Dive Beyond Limited
Old Harbour Dive Centre
Dive academy
Divers Down
Reviews for HMSM SIDON
Conditions
Ocean conditions, forecast and tides for HMSM SIDON
HMSM SIDON Ocean Conditions
Monthly averages for HMSM SIDON, 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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