Overhead diving and essential cave diving safety skills

TDI Intro to Cave Course

Overhead Environment Training

Step beyond the light zone and into true overhead environment diving with the TDI Intro to Cave Diver course in Phuket, Thailand. This course builds on cavern training and introduces the essential skills required to safely conduct limited cave penetration dives without direct access to natural light.

The TDI Intro to Cave course is the critical transition between cavern diving and full cave diving—where precision, discipline, and awareness become essential.

What Is the TDI Intro to Cave Diver Course?

The TDI Intro to Cave course trains divers to safely explore cave environments beyond the cavern zone, where:

  • there is no direct natural light
  • navigation relies entirely on guidelines
  • a direct ascent to the surface is not possible

This course focuses on developing control and consistency, rather than extending limits.

Cavern vs Intro to Cave – What Changes?

This is where diving becomes truly technical.

Cavern Diving:

  • Always within sight of natural light
  • Short, simple penetrations
  • Lower complexity


Intro to Cave:

  • No natural light
  • Increased penetration distance
  • Complex navigation using lines
  • Higher task loading and risk

👉 The Intro to Cave course is where divers learn to operate independently of visual reference to the surface.

Why Take Your Intro to Cave Course in Thailand?

While Phuket does not have full cave systems locally, it provides an ideal environment to prepare:

  • calm conditions for mastering core cave skills
  • controlled environments for line work and buoyancy
  • strong focus on technique before real cave environments

This ensures you arrive at cave systems with a solid foundation.

What You Will Learn

The TDI Intro to Cave course focuses on discipline, control, and safe cave procedures.

Theory Topics Include:

  • cave environment hazards
  • gas management rules (rule of thirds and beyond)
  • advanced guideline navigation
  • dive planning for cave systems
  • stress management and situational awareness
  • emergency procedures in overhead environments

This course is highly demanding in terms of precision.

Skills Include:

  • advanced buoyancy and trim in confined spaces
  • guideline laying, following, and navigation
  • lost line and lost diver drills
  • gas sharing while following a guideline
  • emergency exit procedures
  • propulsion techniques to avoid silting
  • maintaining awareness in zero visibility scenarios

These are the core survival skills for cave diving.

Equipment Used During Training

Divers will use a full overhead environment configuration:

  • twinset or sidemount system
  • primary and backup dive lights
  • reels and guideline systems
  • redundant gas supply
  • streamlined technical setup

Consistency in equipment configuration is critical.

Real Challenges in Intro to Cave Diving

This course introduces a completely different level of diving.

Divers must manage:

  • zero natural light conditions
  • navigation without visual reference
  • increased task loading
  • maintaining calm under pressure
  • precise control in confined spaces

The course is designed to build confidence through structured progression.

Who Is This Course For?

The TDI Intro to Cave course is ideal for:

  • cavern-certified divers progressing to cave diving
  • technical divers expanding into overhead environments
  • divers interested in exploration and cave systems
  • experienced divers seeking advanced skills and challenges

Course Prerequisites

To enrol, you must:

  • Be at least 18 years old
  • Hold a TDI Cavern Diver certification (or equivalent)
  • Have appropriate diving experience in overhead environments

For our training environment we also like you to have TDI Deco Procedures or PADI Tec 45

Course Structure

Typical duration:

  • Day 1: Theory and confined skill development
  • Days 2–4: Open water / cave environment training dives

Focus is on repetition, control, and precision.

What Comes After Intro to Cave?

Completing the TDI Intro to Cave course prepares you for:

  • Full Cave Diver certification
  • Advanced cave exploration
  • CCR cave diving
  • Expedition-level overhead diving

This course is the gateway to true cave diving.

Why Choose Us for Your Intro to Cave Course?

  • Experienced cave and technical diving instructors
  • Strong emphasis on safety and discipline
  • Small group training
  • Structured progression into full cave training
  • Real-world skill development

You will leave this course with the control and awareness required to safely enter cave environments.

If you’re ready to take the next step into true cave diving, the TDI Intro to Cave Diver course is where your journey begins.

Contact Us

Have questions or need help? Use the form to reach out and we will be in touch with you as quickly as possible.