JMT M99
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.
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
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.
Nearest Dive Centres to JMT M99
Dive shops near JMT M99
Dive Looe
Plymouth Diving Centre
Sound Diving Limited
Viewpoint Diving Centre
Scuba 2000
Karleyth Diving Ltd.
Reviews for JMT M99
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)
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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