Get your SDI Open Water Scuba Diver certification

Start diving the world in 3 easy steps

You saw on TV the beauty of tropical oceans and dreamed about exploring this amazing underwaterworld? Your dreams come true with the SDI Open Water Scuba Diver!

The SDI Open Water Scuba Diver course makes it possible for you to complete all of the academic requirements for your entry-level scuba diver certification online. You can get started right now and, when you are done, you will then complete your in-water skill-development sessions and final open-water training dives with me in Mexico or any other SDI dive center in the world. It’s that simple! Now, go dive the world with your SDI certification.

The 3 Steps to become an SDI Open Water Scuba Diver

Get Smart


Get Smart


Start your SDI Open Water Scuba Diver course and master all the important academic information online. You can complete this phase through self-study, at your own pace, in the convenience of your home or office.  All eLearning courses work on mobile and tablet devices too.

Get Wet


Get Wet


For entry-level certification courses (as well as some continuing-education classes), the next step will be to complete your in-water skill-development training. This takes place in a swimming pool or similar body of confined water, under the supervision of an SDI Instructor.

Go Diving


Go Diving

open water

The final step is to complete the required number of SDI open-water training dives under the supervision of your SDI Instructor. Here you will apply what you have learned during your academic and skill-development sessions, while learning practical lessons that can only be gained through real-world experience in open water.

Learn to Dive with SDI’s Open Water Scuba Diver Course

SDI Divers signal OK and Hang loose
dive agencies equivalency

Who this course is for:

  • Persons desiring to obtain a Scuba Diving certification
  • Persons interested in underwater exploration

Course prerequisites

  • Minimum age 18, 15 with parental consent

What you can expect to learn:

The SDI Open Water Scuba Diver Course will cover all of the necessary skills and knowledge for open water scuba diving, including:

  • The aquatic environment: vision, light, sound, heat loss, tides, currents, waves, surge, etc.
  • Physics and physiology: buoyancy, pressure, air spaces, breathing compressed air, mixed gases, etc.
  • Dive equipment selection, assembly, use and maintenance
  • Dive planning
  • Basic scuba skills including mask and regulator skills, swimming underwater, buoyancy control, basic rescue techniques, and emergency procedures
  • And much more!

What’s in it for you:

Upon successful completion of the SDI Open Water Scuba Diver course, graduates may:

  • Conduct open water dives in conditions similar to their training
  • Continue their dive education by enrolling in SDI Advanced Diver and Specialty courses

SDI Open Water Scuba Diver minimum requirements:

  • Demonstrate mature and sound judgment concerning dive planning and execution
  • Satisfactorily complete the SDI Open Water Scuba Diver knowledge quests or equivalent online learning course
  • Complete all open water requirements safely and efficiently

How do I take this course?

  • Take it online. SDI Open Water is available in eLearning
  • Course Cost: $129.95 USD for eLearning only.  Pool and open water training not included.  
  • Only pool and open water training including 6 open water dives $650.00 USD

If you want to start elearning now but you are not sure when and where you can attend the practical training, click here

If you want to make a reservation with me for your full course on a certain date and also start elearning, click here


On recommendation of a friend, we contacted Tillmann. It was important to us to have our first diving experience with an experienced instructor who also speaks our language. We were not disappointed. With a lot of patience and humor he explained to us how everything works and also took our son (15) the fear of open water. We also experienced dives in a cenote. For us it is clear that the next vacation will be a diving vacation.

Sabine, Germany

On my first trip to Mexico with a good friend that was doing an underwater filming project, I was recommended to get my diving license with Tillmann. Excellent instructor, very friendly, competent and helpful. I was lucky enough to have private lessons and was extremely happy. I can definitely recommend Tillmann!

Severin, Germany

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