24m
    South Coast, Ireland
    Hook Head SAC

    CASTLE BAY

    Good diving all year

    Protected Area

    Hook Head SAC

    Why dive here

    With 185+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - CASTLE BAY offers some of South Coast's richest wreck diving. Water ranges 9-15°C, warmest July, August, September.

    Best timeYear-round
    WetsuitA drysuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 185+ species recorded
    Water9-15°C · warmest July, August, September
    CharacterWreck dive · max 24m
    StandoutExceptional marine biodiversity

    Castle Bay is a classic South Coast wreck dive, a fishing vessel that went down after a collision back in '71. We love dives like this, where the wreck feels truly settled into its environment rather than just a recent addition. At a max depth of 24m, it's accessible for most divers, though we’d suggest good buoyancy control helps here. What you get is a substantial hull, mostly intact, lying on its starboard side. You can explore the stern, where the prop is usually still visible, and the gantry structure. Keep an eye out for the resident conger eels, they’re often lurking in the darker recesses. We also see plenty of wrasse darting in and out of the skeletal remains of the superstructure. The visibility here can vary wildly, as it often does on the South Coast, so pick a calm day with a good tide window for the best experience. Our favourite part? The way the light filters through the kelp on the shallower parts of the wreck, even on a cloudy day, it adds real character.

    Typical CASTLE BAY Dive Profile

    10m20mSafety Stop0m24m max~30 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Safety Notes

    Depth of 24m - 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 14°C). Drysuit or thick wetsuit (7mm+) recommended.

    Always perform a 3-minute safety stop at 5m before surfacing.

    Today06:4617:4510h 59m daylightGolden hour 16:59

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    Conditions

    Ocean conditions, forecast and tides for CASTLE BAY

    CASTLE BAY Ocean Conditions

    Monthly averages for CASTLE BAY, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (51.71, -8.38) (9km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    14°C

    57°F · Range: 12.3–14.8°C

    Air Temperature

    12°C

    54°F

    Wind Speed

    7.84 m/s

    15.2 knots

    Atmospheric Pressure

    1008.6 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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