Exploration Diver Level 1 Rebreather | Stephan Fehringer | Dive Instructor
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Exploration Diver Level 1 Rebreather

rebreather diver in the blue water

Exploration Diver Level 1 Rebreather

Rebreather upgrade with trimix and decompression gases.

The ISE Rebreather Exploration Diver Level 1 course is structured to prepare divers for the rigors of exploration diving, and to familiarize them with the use of different types of breathing and decompression mixtures. The training focuses on expanding the skills learnt in the ISE Basic of Exploration, and is designed to build the necessary and essential skills required for safe and successful exploration trimix diving. This will include problem identification and resolution, and building the capacity progressively for more challenging dives.
In this course, students will be trained in: a) the use of double tanks and in the potential failure problems associated with them; b) the use of Trimix and Nitrox c) the use of Helium to minimize narcosis; and d) the applications of single decompression cylinder diving with respect to decompression procedures. The exploration diver level 1 class will focus on Nitrox and Trimix, for dives in the 50 meter depth range, and provides an excellent foundation on which divers can build their diving experience and prepare for further ISE programs.


This exploration diver level 1 class will be conducted over a duration of 5 days, and involves at least 5 dives.


  • Student to instructor ratio will not exceed 3:1 in all in-water and surface sessions.
  • Trimix 21/35 & 18/45, 50% Nitrox Deco, 2 Stages, max. depth of 60 meters.
  • Maximum training depth of 60 m, max average depth of 48 Meters.
  • No overhead environment. (i.e caves)
  • Certification expires after 3 years. Students have to re-qualify. (One evaluation dive)


innerspace explorers logoTopics

  • Physics
  • Pressure and gas law review
  • Math relevant for planning, mixing, and using enriched air
  • Physiology
  • Hypoxia
  • Hyperoxia
  • Oxygen toxicity
  • CNS
  • Pulmonary toxicity
  • Tracking multilevel, multi-dive, and multi-day exposures
  • Inert gas narcosis
  • Inert gas absorption and elimination
  • Carbon dioxide toxicity
  • Carbon monoxide toxicity
  • Hyperthermia
  • Hypothermia
  • Decompression illness
  • Accelerated and general decompression strategies
  • Decompression practices on air, enriched air, and oxygen
  • Generic tables, computers, and custom tables
  • Introduction to normoxic and hyperoxic Trimix
  • Advantages over deep air
  • Equipment considerations (DIR emphasis)
  • Singles
  • Doubles
  • Decompression stage bottles
  • BC/harness
  • Regulators, depth gauges, pressure gauges, and hose routing
  • Manifolds
  • Surface marker buoys and spools (for deco platforms)
  • Computers and bottom timers
  • Exposure suit appropriate for the environment
  • Dive planning
  • Operational planning
  • Support
  • Teams
  • Team planning
  • Gas matching
  • Oxygen limits
  • Nitrogen limits
  • Emergency procedures
  • Omitted decompression procedures
  • Miscellaneous issues including limited deco gas, out of gas, team separation, etc.
  • Procedures
  • Bottom and deco gas
  • Normal operations
  • Procedures for failure, loss, or inadequate supply
  • Gas mixing
  • Analyzing and labeling gas supplies
  • Line following
  • Survey technics appropriate for level of diving


Drillstechnical diving attersee kamin

  • Reel and guideline use
  • Dive team order and protocols
  • Touch contact
  • Manifold operation and failures
  • Use of safety spools and reels
  • Basic navigation skills
  • Pre-dive drills
  • Survey and measuring techniques


Get free pre-class advice, just send me a message for details!


  • Must be at least a minimum 18 years of age.
  • Must be ISE BoE certified or equivalent.
  • Must have a minimum of 100 dives beyond open water certification.
  • Must be able to perform the following
    • 400 meters swimming in less than 15 min & free dive a distance of 15 Meters
      or alternatively
    • Snorkel 800 meters (with fins) in less than 18 min. & free dive a distance of 25 meters or alternatively
    • Run 1000 Meters in less than 5 min



Tuition of min 1050 € per student + instructor’s travel and diving expenses. (to be shared equally among all students).

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