Overhead Environment Diver

Overhead environment training with TDI can be categorised into Advanced Wreck and Cave diving.

Advanced Wreck Diver

This course provides training and experience to competently conduct advanced wreck dives.This program includes penetration skills and techniques. Depths shall not exceed the level in which the diver is trained and competent, but in no case shall the maximum depth in this program exceed 55 metres / 180 feet. The objective of this course is to train divers in the proper techniques, equipment requirements and hazards of wreck diving.

Who this course is for:

  • The basic wreck diver looking to: 
  • Learn proper advanced wreck penetration techniques 
  • Advance their technical diving education 

What you can expect to learn: 

  • Use of advanced wreck diving equipment including: 
  • Primary cylinder(s)-dual outlet single tank, independent doubles, or doubles with isolation manifold 
  • Decompression/stage cylinders 
  • Redundant primary regulators 
  • Primary and back-up lighting systems 
  • Penetration/safety reels 
  • Lift bag/SMBs 
  • Wreck penetration procedures 
  • Equipment selection 
  • Pre-dive checks and drills 
  • Stress analysis and mitigation 
  • Guideline use, deployment, following, retrieval 
  • Team awareness and communication 
  • Emergency procedures (equipment failures, catastrophic gas loss, omitted decompression, navigational errors, entrapment/entanglement, loss of visibility, injured/unconscious diver, etc) 
  • SMB/lift bag deployment 
  • Proper trim, buoyancy and propulsion techniques 

 What’s in it for you?

  • Ability to conduct technical wreck diving activities without direct supervision provided: 
  • The diving activities approximate those of training 
  • The areas of activities approximate those of training 
  • Environmental conditions approximate those of training 

Cave exploration at Indonesia. By TDI Instructor Eric Tan

Cave small

Cave Diver

It would seem surprising to know there are actually cave diving sites within South East Asia.While cave diving is still new here, cave system are constantly being discovered in Thailand,Indonesia and Malaysia.

The four progressive level of TDI cave training are:

  •  Cavern Discovery
  •  Cavern Diver
  •  Intro to Cave Diver
  •  Full Cave Diver

Rebreather Cave Diver development programs are also availableand includes:

  •  Rebreather Cavern Diver
  •  Rebreather Intro to Cave
  •  Rebreather Full Cave Diver

Who this course is for:

  • The certified TDI Introductory Cave Diver (or equivalent), who has interest in moving forward with overhead environment diving and expanding their diving techniques, capabilities, range, and more!

What you can expect to learn:

The TDI Full Cave Diver Course takes an in-depth look at all of the following and more. 

  • Standard cave diving policies 
  • Gas management procedures and management to include dissimilar volumes 
  • Psychological considerations of cave diving 
  • Equipment considerations including: 
  • Cylinder options 
  • Regulator options 
  • Buoyancy compensator/harness options 
  • Proper weighting 
  • Reel options 
  • Equipment configurations 
  • Communication (light and hand signals) 
  • Swimming techniques 
  • Body posture/trim 
  • Buoyancy control 
  • Line following 
  • Propulsion (finning) techniques 
  • Physiology 
  • Breathing techniques 
  • Stress management 
  • Decompression theory and its application to cave diving 
  • Cave environment 
  • Conservation 
  • Problem solving 
  • Emergency procedures 
  • Equipment failure 
  • Silting conditions 
  • Accident analysis 
  • Cave diving etiquette

Required skills you will have to demonstrate include:

  • Properly deploy a guideline 
  • Properly use directional and non-directional line markers 
  • Properly follow a guideline with eyes open and closed (simulating loss of visibility) 
  • Air share with a buddy with eyes open, following a guideline 
  • Air share with a buddy with lights off and eyes closed, using touch contact while following the guideline 
  • Remove and replace mask while in contact with the guideline 
  • Demonstrate conservation, awareness, and back referencing techniques 
  • Demonstrate light/hand signals and touch contact 
  • Demonstrate anti-silting techniques 
  • Simulate a primary light failure and use back up light to exit the cave 
  • Demonstrate lost line and lost diver drills 
  • Demonstrate use of reels to perform jumps and gaps required in circuits and traverses to maintain a continuous guideline to open water 
  • Demonstrate buoyancy control, proper trim, and propulsion techniques 
  • Demonstrate proper stress analysis (detection and management) 
  • Demonstrate specialized propulsion techniques in varying types of flow 
  • Equipment check and matching 
  • Demonstrate adequate predive planning

What’s in it for you?

Upon successful completion of this course, graduates may engage in cave diving activities without direct supervision so long as the following limits are adhered to: 

  • The diving activities approximate those of training 
  • Planned dives do not exceed diver’s current certification level 
  • Penetration is limited to the “rule of thirds,” to a maximum depth of 40 metres/130 feet 
  • Diver must maintain a continuous guideline 
  • Proper cave diving equipment must be used 
  • Safety and decompression stops as appropriate or necessary (if trained as TDI Decompression Diver or equivalent) 

Rebreather Cave Diver development programs are also available and includes: 

  • Rebreather Cavern Diver 
  • Rebreather Intro to Cave 
  • Rebreather Full Cave Diver