Underworld Tulum

Underworld Tulum

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We offer top quality training at all levels including cave, technical and rebreather classes.

31/05/2026

We are delighted to support the The Human Diver conference taking place in Vis, Croatia thus week. Some epic diving and some amazing presentations, as well as the debut of the new Learning From Emergent Outcomes class.

Why Rules Get Broken. Does It Matter Who Is Breaking Them? 21/05/2026

This a great article from about how easy it is to rationalise breaking rules, and how systems in diving sometimes need rule breaking to operate.

https://www.thehumandiver.com/post/why-rules-get-broken

Why Rules Get Broken. Does It Matter Who Is Breaking Them? Most rule-breaking in diving isn't carelessness — it's a worn path the system often depends on. Why organisational deviation and individual shortcuts look identical after a bad outcome, and why telling them apart is an important safety conversation.

Photos from Underworld Tulum's post 06/05/2026

Well done to our fellow Royal Navy veteran Peter on taking the first step on his diving journey to become an SSI open water diver. Lots of hard work resulted in a solid pass and we saw some cool stuff along the way. How many OW classes include swimming with a crocodile?!

Photos from Underworld Tulum's post 30/04/2026

Congratulations to Ben on getting through a demanding SSI Overhead DPV class. All Underworld DPV classes involve use of a tow scooter on all overhead dives, multiple stages, oxygen deco and complex team failures a long way back in the cave. We managed to see some epic cave along the way, including a memorable 3 hour graduation dive to the Blue Abyss. This is a new SSI class and ours was one of the first to be run globally. The required 240 minutes of cave DPV time is a little more than some certs require, and we managed to triple it with over 800 minutes in the water.

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MZ526 Lt01, Calle Rio Angostura, Colonia Tumben Kaa
Tulum
77760