SDI - Scuba Diving International

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Scuba Diving International was created in 1999 and grew out of the success of our sister company TDI, which specializes in the more advanced disciplines of dive training. Both students and instructors have embraced the no nonsense approach that the SDI training system offers. We have streamlined the course materials to let students study the essential academics with an emphasis on practical diving skills learned in both the pool and open water environments. SDI was the first agency to require students to be taught with modern dive computers from the onset of training. SDI course materials are state-of-the-art; the materials are lavishly illustrated with photography and graphics. SDI staff is always looking forward and striving to be the innovators in scuba diving education. SDI focus is to make the experience of diving one that is enjoyed by every family member.

It's a fun start on a hot day hitting the water for the ITW swim test! Things are more than halfway done, and the work i...
10/12/2026

It's a fun start on a hot day hitting the water for the ITW swim test! Things are more than halfway done, and the work is outstanding, at SDI World Headquarters training 7 new Course Directors and Instructor Trainers!

10/12/2026

⚙️ Mine diving takes exploration to another level.
🙏🏻 Thanks, Ricardo, for sharing this incredible dive with us!

🎥 Video by

10/12/2026

Another great reminder of why we love diving.
Thanks for letting us share your video!


10/10/2026
Sneak peek from HQ. Everything’s laid out and waiting for our Instructor Trainer candidates to arrive. Over the next few...
10/09/2026

Sneak peek from HQ. Everything’s laid out and waiting for our Instructor Trainer candidates to arrive. Over the next few days, this room will be full of experienced instructors sharpening their skills to train the instructors of tomorrow. Here’s to an amazing ITW!

10/09/2026

➡️ We never get tired of seeing moments like this.
Thanks for letting us share yours! 🤿


10/09/2026

➡️ The deeper you go, the more color 🌈 disappears. 🌊
Watch how the underwater world changes with depth.

10/08/2026

One diver. One ocean. A lasting impact.

What does it really take to change the future of our seas? According to Diana Hollingshead, it starts with showing up.

On Season 2, Episode 21 of Voices Beneath the Waves, host Stephanie Miele, COO of Scuba Diving International (SDI), sits down with Diana: Women Divers Hall of Fame member, conservation leader, and one of the most passionate voices for citizen science in the dive community.

Diana has spent decades turning divers into defenders. She has led Reef Check Foundation initiatives and championed Oregon's kelp forests and marine reserves, proving again and again that real conservation isn't reserved for scientists in lab coats. It's built by everyday people who care enough to get wet, get counting, and get involved.

Join us LIVE as Diana reveals how any diver, whether you're fresh out of Open Water or logging your thousandth dive, can make a measurable difference beneath the surface.

In This Episode

Why citizen science puts real power in everyday divers' hands
How conservation builds stronger, more connected dive communities
Inside Reef Check, kelp forest restoration, and ecosystem monitoring
Inspiring the next generation of ocean stewards

🔴 Watch LIVE
📅 Thursday, October 8, 2026
⏰ 6:00 PM ET

Follow Diana Hollingshead
LinkedIn: https://www.linkedin.com/in/diana-hollingshead-b6319370/
Facebook: https://www.facebook.com/diana.hollingshead1
Women Divers Hall of Fame: https://www.wdhof.org/members/diana-hollingshead
Reef Check Foundation: https://www.facebook.com/reefcheckfoundation
Oregon Kelp Alliance: https://www.oregonkelp.com/people/diana-hollingshead/

10/08/2026

A dive computer can calculate theoretical decompression limits, but it cannot directly measure what is happening physiologically inside a diver’s body. Research examining post-dive vascular bubbles shows why divers should view a computer’s “clear” status as a mathematical calculation, not a ...

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