We are also a Technical Diving International (TDI) centre, offering cave and technical courses, including training on Diver Propulsion Vehicles. TDI was one of the first agencies of its kind and is now the world's biggest technical agency. It’s focus was and still is on providing training materials and education for specialized diving situations ranging from Nitrox to Closed Circuit Rebreathers, as well as for overhead environments such as caves and wrecks.   

Underworld is the only BSAC centre in Mexico, and is also a Premier and a Technical centre offering advanced and technical training.  Claire and Lanny are both long-standing members of the biggest diving club in the world and our extensive experience of running diving expeditions in remote locations makes us ideally placed to give clubs and other groups a fantastic trip.  We are able to teach all BSAC recreational courses and many Skill Development and Technical courses.

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Address: Mz526 Lt01, Calle Rio Augostura, Colonia Tumben Kaa, Tulum, Quintana Roo, MEXICO 

Tel: + 52 (1) 984 114 0398

Email: lanny@underworldtulum.com 

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We are proud to be the first RAID Gold Star centre in Tulum, offering RAID's innovative recreational and technical courses.  RAID is the fastest growing diver training agency in the world and offers access to all courses online, so you always have the most up to date course materials.  Contact us for further details or check out the RAID website by clicking on the logo.


We moved to Tulum because it is home to the the best cavern and cave diving on the planet.  There are hundreds of fantastic cave systems in the area and the closest are just a few minutes drive from the town itself.  The caves are beautifully decorated, shallow and the temperature of the crystal clear water is 25 degrees centigrade all year round.  Whilst there are fantastic opportunities for qualified (and trainee) cave divers, there are also many stunning cavern dives where any certified diver can experience the beauty of the underworld, supervised by one of our expert guides.  For those who prefer ocean diving, the second largest barrier reef in the world is just off the coast and the exceptional marine life of Cozumel is an easy day trip away.


Claire and Lanny can offer a wide range of recreational, technical and cave courses through IANTD, RAID, PADI, TDI/SDI and BSAC.  We can also teach the full range of excellent DAN diver medic courses. You can find out more about Underworld Tulum's course details and prices here.


We can provide cave, cavern and reef guiding tailored to suit your requirements.  Whether you are an open water diver who wants to experience the caverns or ocean for the first time or a seasoned cave diver who wants to visit somewhere new, we can help.  Our trucks are equipped with a first aid kit, emergency oxygen and air conditioning to make your day with us as safe and comfortable as possible.


We have a wide selection of top quality equipment for rent, including cylinders and full cave diving equipment.  We prefer to rent the gear that we use in our own diving:

  • Apeks Regulators
  • Halcyon Wings
  • ​JJ and SF2 Closed Circuit Rebreathers
  • Halcyon/Suex Diver Propulsion Vehicles
  • Scubapro Fins