TDI Intro to Cave


TDI Intro to Cave course

This course is an introduction to the basic principles of cave diving using a single guide line. The Intro to cave course is the second step in the development of cave diving techniques, building directly upon the TDI cavern diver course. This introduction to cave diving is not intended to train divers for all facets of cave diving, instead, the objective of this course is to master the skills learnt during the cavern diving program as well as learning and practicing the additional techniques and procedures required for simple cave dives.





TDI Intro to Cave course

The Introductory cave diver course is the second level of Overhead Environments training after the Cavern Diver course and must be completed before enrolling in the TDI Full Cave Diver course. The objective of this course is to enhance the skills learnt in the Cavern Diver course and to learn the new skills and techniques which are fundamental for basic cave diving. This course is for the certified TDI Cavern Diver or equivalent who has interest in moving forward into overhead environment diving and expanding their diving techniques, capabilities, and more.

Course Structure

Water Execution:


Six single guideline cave dives conducted at 2 different sites and 6 different caves




Course must be taught over 4 days.

If combined with a cavern diver course, a minimum of 5 days and 8 dives.

Certification Requirements:

Satisfactorily complete the TDI Intro to Cave Diver course written examination with a passing score of 80%, followed by 100% remediation by the instructor

Perform all land drills and cave dive requirements efficiently

Demonstrate mature, sound judgment concerning dive planning and execution

Maintain an appropriate level of awareness and respect for the environment

Log all training dives

Student Diver Prerequisites:

To enroll in the TDI Intro to Cave course, student divers must:

Minimum age 18, 15 with parental consent

Provide proof of certification as a TDI Cavern Diver or equivalent

Skills include:

Properly deploy a guideline

Proper use of line markers

Guideline following with eyes open and closed (simulating loss of visibility)

Air share with a buddy with eyes open, following a guideline

Gas sharing with a buddy with lights off and eyes closed, using touch contact communication while following the guideline

Remove and replace mask while in contact with the guideline

Conservation, awareness, and back referencing techniques

Light/hand signals and touch contact communication

Proper anti-silting techniques

How to deal with a primary light failure and use back up light to exit

Perfect buoyancy control, proper trim, and propulsion techniques

TDI Intro to Cave Diver Qualifications

Upon successful completion of this course, you will be able to safely execute single guideline cave dives without supervision, as long as you stay within the following limits:

Diving activities approximate those of training

Plan dives not to exceed current level of training

Penetration is limited to 1/6th of available gas volume when using redundant air sources

Maximum depth of 40 metres/130 feet

Use proper cave diving equipment

Maintain a continuous guideline


Upon successful completion of this course, divers are qualified to continue on to the next level of training: the TDI Full Cave Diver course.

Why Divers UnderGround

At Divers UnderGround©, we believe in providing our student divers with as much knowledge as possible along with the best tools. We will help you advance safely into overhead diving. Our experience will help you understand the necessity for following proper cave diving protocols and the risks involved in becoming complacent in this type of environment. We are constantly diving in new and more complex caves and systems as well as constantly involved in exploration and cave surveying projects.


Although any good Diving Instructor can easily teach Cave Diving skills as it really isn’t rocket science, the importance of the experience the instructor has in actual Cave Diving situations cannot be understated. Real stories help students understand the necessity for being proficient at Cave Diving skills and procedures. Furthermore, being aware of possible situations or scenarios brought up by the experienced cave diving instructor are priceless for anyone thinking about becoming a Cave Diver. Repeating skills over and over is great training, however, an instructor who can teach valuable lessons is one who takes these skills into the real cave diving world and actually puts them to the test. That is the only way to keep cave diving training realistic as otherwise legends and myths of killer clips and superheroes arise from scary dark holes underwater where no one else can ever reach…


Valuable Cave Diving Instructors must be actively involved in cave diving activities beyond teaching Cave Diving courses. Instructors must also be actively participating in diving activities at least one level above what they are teaching.

TDI Cave Instructor Mexico Camilo Garcia
Razor Sidemount Cave Instructor
TDI Full Cave Diver Course
TDI Full Cave Diver Course
TDI Intro to Cave Diver Course
TDI Cavern Diver Course

Intro to Cave Diver Course

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