Schnuppertauchen Bielefeld

Tech Diving

Technical Diving

Technical diving has changed significantly in recent years. Training as a technical diver has also improved through specialised associations.

Many decompression-relevant results have emerged from basic diving medical research and are waiting for practical implementation. NASDS, as one of the oldest and most modern recreational diving associations in the world, has launched a new Tec track in line with this change.

First and foremost, the safety of technical diving must be guaranteed. The level of training is high, the teaching content is modern and concise to the point, useless knowledge is omitted. There are clear safety standards as well as general recommendations. This leaves enough room for the individual instructor to implement his or her own ideas; on the other hand, he or she can rely on and refer to a stable foundation of sensible guidelines.

Everything is always adapted to the latest findings, and health, safety and quality are always in the foreground here as well.

NASDS Discover Tec Diving

Discover Tec allows divers who are curious about technical diving to test a complete technical equipment – “rig” in a controlled environment. Although this equipment is not mandatory for Discover TEC, we want to give participants exactly this feeling.

Thus, it is provided by us in this programme if none of your own is available.

Precisely because “Discover TEC” can be credited to the TEC 40 course if the performance requirements are met, it is advantageous to use the same equipment that is prescribed for TEC 50 at the latest.

However, for participants who only want to “get a taste” of the course, there are no performance requirements.

Therefore you will receive general information regarding “technical diving” and try out the following equipment during a dive:

  • Double unit with barrier bridge (manifold), stages & lift bag.

Prerequisites: Open Water Diver or equivalent, 18 years, 10 logged dives.

Course duration: 1/2 day, 1 dive in confined open water/pool or confined open water.

NASDS Tec 40 Diver

The TEC 40 course teaches the basic exercises/skills required for all technical dives. This course is the introduction to technical diving and the prerequisite for all other technical diving courses.

The TEC40 focuses primarily on the mastery of precise, fin stroke techniques, buoyancy/trim, team awareness and controlled ascents with the use of a surface buoy. It also focuses on proper equipment configuration.


  • Advanced Open Water Diver or equivalent.
  • Enriched Air Diver or equivalent
  • Deep Diver or equivalent or proof of at least 10 open water
  • dives to 30 metres.
  • dives to 30 metres
  • 18 years of age
  • 30 logged dives, of which at least 10 were open water dives with EANx deeper than 18 metres
  • a valid medical certificate (not older than one year)

Course duration: 3 days, theory development, 1 confined open water/pool or limited open water dive and 3 open water dives.

Course material: Tec 40 Diver Manual German

Important note: The course fee does not include tank fills, rental materials and documentation.

NASDS Tec Trimix 60

The Trimix 60 course increases the depth and complexity of the dives. The student learns to perform demanding and safe decompression dives with at least two stages/gas changes and with normoxic Trimix (TMX 18-21% O2) as base gas to a maximum depth of 60m. For the first time a third decogas can be used (Triox 35/25, Triox 50/15 from 21m and 100% oxygen from 6m). In addition to extended theoretical training, stress management, rescue exercises and ascents are trained, especially in open water.

What are the requirements?

You must be a Rescue Diver or have an equivalent diving certification from another training organisation. Divers with equivalent certification from another organisation must prove that they have completed a course in CPR and first aid within the last two years. You must have completed the Tec Deep Diver course or have evidence of an equivalent course from another organisation in decompression deep diving with air and oxygen enriched air.


  • Theory: min. 8 hrs.
  • Dives: 5 (4 with trimix)
  • Max. depth: 60 m
  • Time frame: min. 5-7 days

What will you do?

The Tec Trimix 60 course is designed to extend the depth open to technical divers trained in technical decompression diving with air, enriched air and oxygen beyond 50 metres in open water. This course is intended for technical divers who have completed the Tec Deep Diver course (or an equivalent course from another training organisation). The course extends their depth range by training them to use trimix.

What teaching material do you need?

The Tec Trimix Manual and the Tec Deep Diver Manual, but you can also bring any other manuals.

NASDS Tec Trimixer Diver 100

The Trimix-100 course expands on what has been learned so far. In this course the student learns to perform demanding and safe decompression dives with multiple gas changes and with hypoxic trimix to a maximum depth of 100m. For this purpose, the use of a bottom stage and the possible malfunctions associated with it are trained. Bottomstages increase safety by providing an additional gas reserve and allow for flexible dive planning. The use of a leash is also a key practical topic.

Where is this course taught?

It is possible to do this course here in Germany, then we dive in Wildschütz (near Leipzig), which is a quarry that has a depth of 74m.

It is also possible to do this course in Switzerland and Austria. If you prefer warm or warmer water, you have the possibility to fly with us to Spain or Florida to do this course there.

  • Theory: min. 5-8 hours
  • Dives: 3-4
  • Max. Depth: 100 m
  • Duration: min. 4-5 days

O2 Service Technique

The purpose of the Oxygen Service Technician Specialty Course is to familiarise divers with the operation, maintenance and care of diving equipment used with pure oxygen.

The course is not a repair course. Training in the revision and repair of equipment is not part of the course, only the service for oxygen purification.

Fun and safety should be the main focus of the training.

This course includes theory, practical exercises and two workshops

What has to be removed ?

As already mentioned, not every substance oxidises at the same rate. One of the most dangerous substances in combination with oxygen is FAT !!!

Fat oxidises abruptly and can cause an explosion !!!

Other substances such as vulcanised rubber (usually in the form of O-rings) quickly lose their elasticity and become brittle. O-rings made of VITON, on the other hand, are oxygen-resistant and last much longer. On the other hand, they are not quite as soft.

All other contaminants such as dust and dirt, the smaller the particles, can burn just as abruptly, especially if the combustion was triggered by other substances.

Concentrated work is important in oxygen service.

  • Course duration: 2 days
  • Cleaning materials and tools are provided.

Trimix Gas Blender

The participant learns the safe handling of trimix mixtures and pure oxygen as well as the safe production of trimix mixtures using different methods.

Course requirements: at least 18 years of age

Nitrox Gas Blender

For the Brevet Gasblender the participant does not necessarily have to be a diver. In clubs, for example, a gas blender who does not dive himself can take care of the compressor and gas mixing. Concerning the compressor, a separate training is required, the training for Nitrox or Trimix gas blender is regulated in the following.

The participant in the Nitrox Gas Blender Course learns the safe handling of Nitrox mixtures and pure oxygen as well as the safe preparation of Nitrox mixtures by different methods.

Course requirements: minimum 18 years of age.

Practical applications:

A minimum of three lessons on oxygen purification, calculating mixtures and blending. Students will blend/assist in blending at least five times to an accuracy of the analysed oxygen content of one percent of the desired mixture.

In this course, the gas blender learns that he or she is able to transfer and mix gases and perform the necessary calculations and measurements in compliance with general and national safety guidelines.