RADIATION
Protected Area
Switha
Why dive here
With 140+ marine species recorded in the area - including blue whales, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - RADIATION offers some of Scapa Flow, Orkney's richest wreck diving. Water ranges 8-14°C, warmest July, August, September.
Radiation isn't about huge schools of fish or delicate corals, it's about the sheer immersion in a purpose-sunk wreck, completely colonised by life. This ex-longliner, now resting upright at 19 metres, makes for a perfect multi-level dive. We love working our way around the wheelhouse, seeing the gauges and controls still largely intact, before dropping down to explore the hold. It’s a proper hands-on experience, often with a slight chill in the water that reminds you exactly where you are. Visibility usually hovers around 8-10 metres, sometimes more, sometimes less, but it’s always enough to appreciate the scale. Look out for the resident wrasse darting between the deck fittings and the plump plumose anemones that cling to every surface. Our favourite moments are pausing by the bow, watching the light filter down through the often-calm Scapa Flow surface, highlighting the wreck’s silhouette. It's an ideal site for anyone keen on wreck penetration practice, or just enjoying a relaxed dive on a structure that feels genuinely robust.
Typical RADIATION Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Depth of 19m - Advanced Open Water certification recommended.
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Cold water this month (avg 13°C). Drysuit or thick wetsuit (7mm+) recommended.
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to RADIATION
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Conditions
Ocean conditions, forecast and tides for RADIATION
RADIATION Ocean Conditions
Monthly averages for RADIATION, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (58.64, -3.16) (8km away)
October Averages
Sea Temperature
13°C
55°F · Range: 11.4–13.8°C
Air Temperature
10°C
50°F
Wind Speed
9.26 m/s
18.0 knots
Atmospheric Pressure
1005.3 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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