Helium in your mix, narcosis managed, and a depth rating to 60m that opens Malta's spectacular WWII wrecks beyond air's reach — HMS Stubborn and the main structure of Le Polynesien. The course that takes technical diving to a genuinely new level.
The TDI Trimix Diver course opens up Malta's deep wrecks beyond the reach of air and gives you the skills to dive them properly. Helium in your mix means narcosis managed, depth extended to 60 metres, and wrecks like HMS Stubborn and the main structure of Le Polynesien — genuine WWII history lying intact on the seabed — finally within reach.
HMS Stubborn at 56 metres and Le Polynesien's main structure down to 60m are extraordinary Second World War wrecks in remarkable condition. Diving them responsibly on air or standard nitrox isn't viable; at those depths the narcosis load is significant and the risks are real. Helium-based trimix manages that problem entirely, giving you a clear head at depth and the capability to plan and execute these dives properly. The deeper wrecks — HMS Southwold at 75m and beyond — come next, with Trimix 75.
The course runs 5–7 days with dives to 60 metres. The first section covers gas physics, decompression theory with multiple inert gases, isobaric counterdiffusion, and dive planning at this level — all classroom work that directly underpins what you'll do underwater. Then comes application: multiple dives with multiple gas switches, real decompression obligations on genuine wrecks.
Sam brings extensive real-world deep trimix experience to this course — the kind of knowledge that goes beyond the manual and into what actually happens when you're executing a complex dive plan at depth. You'll finish with the skills to build a conservative, well-structured dive plan and the confidence to execute it effectively.
This is a skills-based course, not a time-based one. Progress is measured by genuine competence — gas planning, valve drills, deco execution — and the certification reflects what you can actually do in the water. Every student develops at their own pace, and the course is structured to support that.
HMS Stubborn at 56m is a genuinely extraordinary wreck in extraordinary condition. If diving a British submarine from 1942 is on your list, this is the course that gets you there.
Trimix Diver opens up everything between 40m and 60m that you couldn't responsibly do on air — which in Malta is a significant list. It's also the gateway to going deeper: Trimix 75 extends you to 75m (HMS Southwold), and Advanced Trimix takes you to 100m for wrecks like ORP Kujawiak. The very deepest sites — HMS Olympus, HMS Russell — lie beyond open circuit altogether.