A Malta-designed course extending you to 75 metres — opening iconic wrecks like HMS Southwold. Entered from Advanced Nitrox and Decompression Procedures, so you can come to it directly, or run it as an upgrade if you already hold Trimix Diver.
Trimix 75m was designed right here in Malta to fill a real gap — sitting between standard Trimix Diver (60m) and Advanced Trimix (100m). It extends your depth range to 75 metres without committing to the full Advanced Trimix programme, and for many divers it's the sweet spot: it opens up wrecks like HMS Southwold and the full depth of Le Polynesien with proper bottom time. Worth knowing that it doesn't sit behind the 60m course — it's entered from Advanced Nitrox and Decompression Procedures, so you can either run it as an upgrade if you already hold Trimix Diver, or come to it directly.
HMS Southwold is a Hunt-class destroyer that went down in 1942 during Operation Pedestal. She lies in two sections at around 73 metres off Malta's east coast, and she's one of the most historically significant wrecks in the Mediterranean. At standard Trimix depth (60m) you're looking at her from above. At Trimix 75m you're on her, with meaningful time to take it in.
The course runs 6–8 days because we're dealing with extended decompression obligations — deco stops that can run 60+ minutes — and high-helium blends that need careful planning. Gas density becomes a real consideration at this depth. Equivalent narcotic depth (END) matters. The number of cylinders you're carrying matters. We work through all of it methodically before we get in the water.
You'll need a solid decompression foundation before this course makes sense. The prerequisites are TDI Advanced Nitrox and Decompression Procedures (or equivalent) plus 100 logged dives — not as boxes to tick, but because the experience changes how you process what we're covering. Divers who arrive with recent decompression diving and good discipline get far more out of the week than those who haven't run a deco dive in two years.
This course builds the skills and discipline you'll need if you decide to pursue Advanced Trimix later. But plenty of divers stop here — 75 metres gives you access to the vast majority of diveable wrecks worldwide, and it's a depth you can plan and execute conservatively without the logistics and cost spiralling.
Le Polynesien at 65m and HMS Southwold at 73m are bucket-list wrecks. This course opens them both up with the depth range and decompression training to dive them properly — not just reach them, but actually experience them.
Trimix 75m opens up the 60–75m band — HMS Southwold (75m), the full depth of Le Polynesien (65m), Schnellboot S-31 (68m) — with the skills and depth rating to dive them conservatively. It's also the logical stepping stone to Advanced Trimix, which extends you to 100m for the deepest open-circuit wrecks like ORP Kujawiak (~100m).