TDI Extended Range

The TDI Extended Range course at Dive Subculture Technical is designed for divers looking to push their depth limits while staying within the boundaries of traditional air diving. This course allows you to extend your depth range up to 55 meters (180 feet) using air as a breathing gas, and it focuses on the skills and techniques necessary to safely manage these deeper dives.

During the course, you’ll learn about advanced gas planning, decompression strategies, and the proper use of multiple cylinders to manage your gas supply. You will gain the knowledge to calculate extended bottom times, prepare for staged decompression stops, and handle potential problems that can arise in deep diving environments. The course includes both classroom theory and practical training, with dives that progressively increase in depth to ensure you are comfortable with the skills at each stage.

This course is ideal for experienced technical divers who wish to explore deeper wrecks, reefs, and other underwater sites while still using air as the primary breathing gas. By completing the TDI Extended Range course, you’ll be equipped with the skills and confidence to plan and execute dives to greater depths, opening up new possibilities for exploration in more challenging and adventurous environments.

The TDI Extended Range course also emphasizes critical safety protocols and emergency management techniques essential for deep diving. You will learn how to handle potential in-water emergencies, including out-of-gas situations and equipment failures. Additionally, the course will cover the physiological effects of deep diving, including nitrogen narcosis and its impact on cognitive functions. Understanding these concepts will empower you to make informed decisions underwater and enhance your ability to respond effectively to unforeseen challenges.

 

Furthermore, this course is structured to foster a strong sense of team dynamics and effective communication among divers. You will practice essential skills such as buddy checks, dive briefings, and contingency planning to ensure safety and preparedness for every dive. The experience gained through collaborative exercises and simulated scenarios will not only enhance your confidence but also prepare you for the responsibilities that come with deeper diving. By the end of the TDI Extended Range course, you’ll be well-prepared to explore the depths with the knowledge and skills needed for safe and exhilarating underwater adventures.

TDI Extended Range FAQs

  • The certified TDI Advanced Nitrox/Decompression Procedures diver looking for the next step in technical dive training. Whether you’re looking to expand upon your skills, experience, or just go a little deeper to see an area of interest, this course is for you!
  • Minimum age 18

  • Certified as a TDI Advanced Nitrox Diver and TDI Decompression Procedures Diver, or equivalent

  • Proof of a minimum of 100 logged dives, of which 25 must be deeper than 30 metres/100 feet
  1. The TDI Extended Range Diver Course takes an in-depth look at all of the following and more:

    • History of deep air diving
    • Physics
      • Pressure review
      • Formulas for solving dive planning problems, maximum operating depth (MOD), best mix, and more
    • Physiology
      • Hypoxia
      • Oxygen toxicity
      • Nitrogen narcosis
      • Nitrogen absorption and elimination
      • Carbon dioxide toxicity
      • Carbon monoxide
      • Hyperthermia
      • Hypothermia
    • Decompression Options
      • Air
      • Nitrox
      • Oxygen
    • Equipment considerations
    • Dive tables
    • Dive planning
      • Operation planning
      • Team planning
      • Emergency planning
    • Diving procedures
    • Descent considerations
    • Ascent considerations
    • Technical dive support
    • Navigation
  2. Some of the required skills you will have to demonstrate include:

    • Use START before every dive
    • Stress analysis and mitigation
    • Gas matching procedures
    • Demonstrate buoyancy control; ability to hover at fixed position in water column without moving hands or feet
    • Show good awareness of buddy and other team members through communications, proximity and team oriented dive practices
    • Demonstrate competence managing 2 stage cylinders, either 2 deco gas or 1 deco and extra bottom gas, including drop and recovery while maintaining position in the water column
    • Demonstrate ability to confirm gas switches at depth with buddy/team members
    • Demonstrate lift bag deployment from depth and use of bag as back-up buoyancy device
    • Demonstrate air-sharing ascent from depth while one member of buddy team is without mask, both as a donor and recipient
    • Create contingency decompression schedule after simulated loss of decompression gas
    • Remove and replace mask, deploy back up mask
    • Demonstrate tired diver tow at depth and on surface; 30 metres/100 feet lateral
    • Complete a horizontal breath-hold swim at depth for 15 metres/50 feet with mask off or blacked out
    • Properly execute the planned dive within all pre-determined limits
    • Demonstrate the proper procedures for switching and isolating a malfunctioning regulator, this skill is to be performed at a depth no deeper than 40 metres/130 feet
    • Demonstrate the proper navigational techniques for the specific dive
    • During 2 dives, demonstrate an ascent with ascent reel and lift bag and perform staged decompression
    • During one of the dives, tow a simulated unconscious diver, while at depth, 9 metres/30 feet to ascent line and simulate an emergency rescue ascent technique
  • The diving activities approximate those of training
  • The areas of activities approximate those of training
  • Environmental conditions approximate those of training
  • Upon successful completion of this course, graduates are qualified to enroll in the TDI Advanced Wreck ,TDI Trimix, and TDI Advanced Trimix courses
  • Satisfactorily complete the TDI Extended Range Course written examination with a passing score of 80%, followed by 100% remediation by the instructor
  • Complete all open water requirements efficiently
  • Demonstrate mature and sound judgment concerning dive planning and execution

Course Duration - 3 - 4 Days

Academics 1 Day

Pool Session 1 Day

Open Water 4 Dives

Course Structure

Technical Diving Guidelines Dive Subculture Technical

Equipments Required (All Technical Courses)

  • Primary and Secondary Regulators (Depends on Configuration)
  • Technical Back-mount BCD (Wing & Bladder) or a Technical Sidemount Harness
  • Primary Mask + Back Up Mask
  • Wet Notes and/or Slates
  • One Lift Bag and/or SMB
  • Dive Computer and Timing Device/or Backup Computer
  • Decompression Regulator(s)
  • Reels and Spools
  • Compass
  • Torch and Back Up Torches
  • Exposure Protection 3mm/5mm or Dry Suit 

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