Decompression Theory

Let's talk about decompression theory, how tables and dive computers work. You will know how compartments, half times, M-values are used to make models for your tables or computers to keep you safe.

Dive Equipment

We tell you about tanks and tank maintenance, burst disks, balanced and unbalanced regulators, venture valves, pilot valves, up-stream and down-stream valves, and types of depth gauges.

The Physics of Diving

We will keep the numbers to a minimum, and we promise: no formulas. We will show you how to use your experience as a diver and your common sense to understand and calculate everything. If you have a fear of physics and calculations, as we know many of you have, we will cure you from it. Give it a go. You will calculate buoyancy, air consumption, pressure, and partial pressure with a smile on your face. Well, perhaps that is too much to ask. Without sweating, let’s settle for that.

The Dive Environment

Learn about tides, currents, waves, coasts, ecosystems. Why are there usually two tides per day, but only one Moon? Why do currents follow a certain pattern over the globe? What makes waves big, how do they break at the beach? How many different types of coasts are there, and why? How do marine biologists talk about the marine life they study and describe?

The Physiology of Diving

What happens in your body when you go diving? In the physiology of diving, we will have a look at blood, hearts, lungs, ears, and all the things that can go wrong. More importantly, we will give you the knowledge you need to respond when things go wrong, and even more importantly, how to avoid things going wrong. That does not mean you won’t need an Emergency First Responder course. You do, because you need skills and practice. But you will know all you need to know.

Welcome to Easy Dive Theory!

Whatever your diving level or experience, a good knowledge of dive theory is important in keeping you safe and allowing you to enjoy the underwater world to the maximum. However, we know that the place where you learn most about diving is underwater, and we also know that you don't want to spend time in a classroom when you could be blowing bubbles. This site makes learning dive theory easy and fun. You can learn dive theory whenever you like, wherever you like. Dive in!

Take our Pro Theory Course

Take our Pro Theory Course
The ideal way to prepare for theory exams for dive professionals, or to get to know the theory behind your hobby.

Find our book on Amazon

Find our book on Amazon
Our book 'The Theory of Recreational Scuba Diving' is available on all Amazon stores in both Kindle and paper version.

Ask a question

Ask a question
Do you have a question about dive theory? Ask it in our forums.

Join My Bubble

Join My Bubble
Make friends with fellow divers on My Bubble.

Book your Pro Dive Course

Book your Pro Dive Course
If you are looking to book a PADI Divemaster or PADI Instructor Course contact our partner Mark Soworka's Dive-Careers Worldwide.