Wreck of Iona (Possibly)
Protected Area
Muckle and Little Green Holm
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) - Wreck of Iona (Possibly) offers some of Scapa Flow, Orkney's richest wreck diving. Water ranges 8-14°C, warmest July, August, September.
The ‘Iona’ is one of those Scapa Flow wrecks that we find ourselves returning to, even if its true identity is still a bit of a mystery. We’re talking about a classic Blockship here, intentionally scuttled to defend the eastern approaches during WWII. Dropping onto her bow, you immediately get a sense of that wartime purpose. The hull is upright and largely intact, encrusted now with those deep-water anemones and colourful hydroids that are so typical of the Flow. What we really love about the Iona is the way the light filters through the structure. It’s never bright down here, but the ambient light playing on the kelp-covered deck and the occasional swim-throughs creates a really atmospheric dive. Look for the Curled octopus tucked into crevices, and we’ve often seen Atlantic cod patrolling the deeper sections. Visibility can be a bit variable, so pick a day with a settled forecast. It’s a great dive for anyone keen on wreck penetration without too much overhead risk. Just remember, these are protected wrecks, so look but don’t touch.
Safety Notes
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.
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Conditions
Ocean conditions, forecast and tides for Wreck of Iona (Possibly)
Wreck of Iona (Possibly) Ocean Conditions
Monthly averages for Wreck of Iona (Possibly), 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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