Trimix
- Information on trimix and other mixed gas diving.
- http://www.cisatlantic.com/trimix/

Mediterranean Sea Technical Divers
- Wreck and cave diving Italian web site. Merlo's well exploration web site.
- http://web.infinito.it/utenti/s/simonant/index.htm

The Dive Bell
- Commercial diver training academy in Townsville, North Queensland, Australia, offering training leading to HSE and Norwegian Petroleum Directorate recognition, nitrox and technical diving, diver medical technician training, and recreational dive courses,
- http://www.divebell.com/

Galicia Technical Diving
- Technical diving education, training and services.
- http://www.galiciatechnicaldiving.be/

Dive-Tech: Nitrox and Technical Diver Training
- Provides course descriptions, links and contacts. Located in Sury, UK.
- http://www.dive-tech.co.uk

On the air....
- Information about the physics of technical diving, including the influences of inert gases on decompression and diver insulation. Decompression calculations using the Varying Permeability Model (VPM) bubble model.
- http://www.decompression.org/maiken/home.htm

Mantis Diving - Brisbane, Queensland, Australia
- Scuba Diving and Technical Diving Courses. Gear Sales, Hire and Service. South East Queenslands Deep Wreck diving specialists. A full range of technical courses for three different certification agencies.
- http://www.mantisdive.com.au

Florida Technical Wreck Diving Journal
- Detailed narrative on all the best technical trimix SCUBA dive sites in Florida.
- http://www.mikey.net/scuba/

Mandarin Divers
- Providing recreational and technical dive courses, including cave, rebreather, deep dive, wreck hunting and expeditions, and dive products.
- http://www.mandarin-divers.com/

Cave Diving Instruction and Guiding
- DIR-Mexico is dedicated to quality cave diving instruction and guiding in Mexico's Yucatan Peninsula.
- http://www.dir-mexico.com

VoodooGas
- Home of the VoodooGas Team.
- http://www.voodoogas.com

Cenote Diving and Training Facility
- Cavern and cave diving in Tulum, Mexico.
- http://www.cenotedive.com

OxyCheq
- Sells oxygen sensors for all types of rebreathers and O2 analyzers. They also sell an oxygen analyzer kit that includes the sensor.
- http://oxycheq.com

Airheads Scuba, Inc.
- Training center for both recreational and technical diving. Sales and service of equipment as well as rebreathers.
- http://www.airheadsscuba.com/

Dive TEK Adventures
- Technical diving adventures and training, in Hawaii. Courses include: Nitrox, Decompression and Extended Range Diving, Trimix, Rebreathers, DPV, Gas Blender, and Service Technician.
- http://www.divetekadventures.com/

Alp-Maritimes Sports
- Scuba courses and education from beginner to expert, cave diving gas mixing, liveaboard trips and certification
- http://technicaldivingops.com

Diver Services
- A site dedicated to the advancement of technical divers.
- http://www.diverservices.com

DE-OX TEMC
- Digital instruments for technical diving, nitrox trimix diving and rebreather diving.
- http://www.temc.it/

GAS Diving UK
- UK based technical diving instruction and access to hard to find dive equipment. Online Equipment configuration details
- http://www.gasdiving.co.uk

Cavediving.org
- Technical, nitrox, cave diving and other courses offered by this organization based in Lake City, Florida.
- http://cavediving.org/

TechDiving.org
- Diving classes ranging from open water to nitrox and other technical courses. Austin, Texas.
- http://www.techdiving.org/