51m
    Cornwall & Devon, United Kingdom
    Rame Head

    JMT M99

    Best months: Jul–Sep

    Protected Area

    Rame Head

    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) - JMT M99 offers some of Cornwall & Devon's richest wreck diving. Water ranges 10-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 176+ species recorded
    Water10-18°C · warmest July, August, September
    CharacterWreck dive · max 51m
    StandoutExceptional marine biodiversity

    The JMT M99, a fishing vessel resting at 51 metres, is a proper technical dive, and one we absolutely love in the often-overlooked waters of Cornwall. This isn't a beginner’s drift, the depth means you’ll need your certs and your wits about you, but the rewards are there. We often find the visibility here surprisingly good for the UK, sometimes pushing 15 metres on a calm day, allowing the wreck to emerge slowly from the green depths. What makes the M99 so special? It’s not just a pile of metal; it’s still very much a ship. You can make out the wheelhouse, the hold, and the deck machinery, all encrusted with dense plumose anemones that pulse gently in the current. We’ve often seen conger eels lurking in the deeper recesses, and large pollack drift lazily above the superstructure. It’s a site that feels remote and wild, a true expedition into the cool, dark Atlantic. Our best advice? Pick a slack tide, pack an extra cylinder, and take your time exploring her.

    Typical JMT M99 Dive Profile

    15m30m45mSafety Stop0m51m max~15 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

    Maximum depth 51m 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.

    Today06:3317:3611h 3m daylightGolden hour 16:52

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    Conditions

    Ocean conditions, forecast and tides for JMT M99

    JMT M99 Ocean Conditions

    Monthly averages for JMT M99, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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