Tmi Jarkko Helin

Tmi Jarkko Helin
Photo: F. Tosoni

GUE Technical Diver Level 1

GUE Technical Diver Level 1 -course (later T1) is the entry level technical diving course of GUE. The aim of the course is to familiarize the diver to the secrets of the deeper, decompression dives. T1 open up possibilities among others to safely explore the superb, a bit deeper wrecks on the Gulf of Finland, like Munin, Sandvike or Eira.

T1 is taught over six days, during which a minimum of 40 hours of tuition is undertaken. The course includes lectures, dry runs, skills and drills underwater, and a minimum of three trimix dives. As it’s the norm within GUE, also this course includes a swim and a free diving test.

The prerequisites for the course are a tech pass from the GUE Fundamentals and a minimum of 100 dives beyond open water certification. The candidate must be non-smoking. On top of the equipment used during the Fundamentals-course, the diver needs a deco gas cylinder with a regulator and a suit inflation cylinder with regulator. Your instructor will be happy to assist you to choose the suitable equipment.


During the course you’ll learn how to use different breathing a deco gasses. You shall practice the skills necessary for safe technical diving, like recognizing and solving the problems associated with the use of double tanks and decompression gasses. After completion of the class, you’ll have the required knowledge and skill to conduct dives to a maximum depth of 51 meters, the maximum length of the decompression stops being 30 minutes. The dives will be conducted using trimix (21/35 or 18/45) in back gas and one deco gas (EAN50 or O2).

This class can be arranged either in Finland or abroad (for example in Malta, Italy, Croatia, Egypt, etc.). The first training dives of the course are done in no more than 10 meters of depth, which means almost any dive site with a decent visibility will do. On the way towards the trimix dives, there’ll be ascent training from a bit deeper water and a location with 30 meters of water is optimal. The experience dives are conducted on suitable sites with the depth ranging from 40 to 51 meters. All and all, the course can be run anywhere, where the aforementioned is possible and the gas logistics are functioning.


Technical diving has no intrinsic value, it’s just another tool to get you to places. If you think there are such places, past your limits, where you would absolutely want to go, technical diving might be the solution. Get in touch and we shall discus, whether technical diving could be something for you!

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