The American Canadian Underwater Certifications, Inc., now popularly known as ACUC International, has grown to become an international leader in high quality sport diver training. Our Head Office is located in Ontario, Canada, which is responsible for the overall running of the Company as well as our North American operations. ACUC Europe, located in Madrid, Spain, is responsible for our operations in Europe, Asia, Africa, Central & South America, and Australia. Besides Canada and Spain, up to now, we also celebrate the opening of delegation offices in Argentina, Cuba, Greece; India and Italy. Recognized for our commitment to safety, education and the environment, ACUC is the civilian certification of choice for many military, police and rescue services in Canada and abroad, and we currently have over 2,000 professionals teaching our programs in over 43 countries around the world. We teach all levels of recreational scuba diving, from basic Scuba Diver to Instructor Evaluator. We also, through an agreement with LifeGuard Systems, offer training in the Public Safety sector. ACUC certified Divers, Divemasters and Instructors are known world wide for their excellent knowledge and diving skills....and that makes us very proud! Madrid, Spain

ANDI International has become well known for its quality educational offerings and expertise in all aspects of and diving & hyperbaric services. Our diving training programs, originating in 1988, introduced nitrox diving to the world-wide community; recreational, commercial and military diving. Freeport, New York

Australian Underwater Scuba Instructors (AUSI) was established in 1994 and is an internationally recognised certification agency. AUSI's goal is to provide the diving industry with affordable, quality education services aimed at ensuring that trainee divers and instructors receive the highest quality diver education. AUSI provides standards, course notes and teaching guidelines for both scuba and snorkel trainees. AUSI Standards meet appropriate International and Australian Standards and Codes of Practice, where relevant. Headquarters located in Eaglemont, Victoria, Australia

The World Underwater Federation was founded in 1959 and by now it comprises over 130 federations from 5 continents. In addition to organizing international underwater sport events it is at the forefront of technical and scientific research and development. It can be associated with elaborating one of the oldest and most extensive dive training systems. Roma, Italy

The largest association of recreational scuba divers in the world, DAN is supported by membership dues and donations. DAN's mission is to help divers in need of medical emergency assistance and to promote dive safety through research,education, products and diving services. DAN is Divers Alert Network, the diving industry's largest association dedicated to scuba diving safety. Serving scuba divers for more than 30 years, DAN provides emergency assistance, medical information resources, educational opportunities and more. Whether you are just learning how to scuba dive or are a veteran of the sport, DAN has a great deal to offer you. Based in Durham, North Carolina

The Divers Alert Network (DAN) is the diving industry's largest association dedicated to scuba diving safety. DAN helps divers in need of medical emergency assistance and promotes dive safety through research, education, products, and services. Divers Alert Network (DAN), a nonprofit organization, exists to provide expert medical information for the benefit of the diving public. DAN's historic and primary function is to provide timely information and assistance for underwater diving injuries, to work to prevent injuries, and to promote dive safety. Second, DAN promotes and supports underwater dive research and education, particularly as it relates to the improvement of dive safety, medical treatment, and first aid. Third, DAN strives to provide the most accurate, up-to-date, and unbiased information on issues of common concern to the diving public, primarily — but not exclusively — for dive safety. DAN World has offices in the Asia Pacific region and Latin America and the Caribbean.

Search Divemaster & Dive Instructor Courses + Internships Around The World. Looking for the best place to become a dive professional? Compare dive courses worldwide from various dive organizations. Search through dozens of locations, view profiles of dive instructors, compare dive conditions, languages, marine conservation programs, free diving options, prices, starting dates and more. Find your PADI Instructor Development Course / PADI IDC, SSI Instructor Trainer Course / SSI ITC, DDI Instructor Training, IANTD Instructor Program, PADI Divemaster Course, PADI Divemaster Internship, Zero to Hero Program and more life changing courses. Amsterdam, The Netherlands

Diving's education-based magazine for new divers, their instructors and those who own and operate dive centers. Monthly articles address a wide range of subjects from how-to and back-to-basics articles, to understanding the complex underwater environments where divers visit. Kansas City, Missouri

Divers Alert Network (DAN) is the world's most recognised and respected dive safety organisation comprised of dive professionals and medical experts dedicated to supporting divers. Through research, medical services, educational programs and global response initiatives, DAN has created an extensive network capable of providing divers around the world with vital services. Every day, divers around the globe look to DAN as their dive safety organisation. Be part of the community and dive safe with DAN. Durbanville, Cape Town, South Africa

Commercial Diving School. Underwater welding and commercial diving school, veteran owned and operated in Seattle. At DIT, you can get prepared for a career in just 7 months. The Divers Institute of Technology offers an intensive, 7-month Commercial Diver program for those interested in commercial diving or underwater welding. As a leading educational facility for the industry, DIT has been training world-class divers since 1968. You will earn certifications that will allow you to dive all over the world. In addition, DIT offers International Assessments, Refreshers, Upgrades, and Specialty Training to divers who are interested in furthering their education and/or gaining additional certification. Seattle, Washington

F.I.I. is the first and only recreational freediving education agency headquartered in the United States. It has an international reputation for upholding the highest safety standards in the industry. The agency was founded by 13-time world-record freediver Martin Stepanek on the core principle of improving the safety and education of recreational freediving, spearfishing, and breath-hold-related activities across the globe. F.I.I. freediving education brings world-class, professional standardization to the freediving industry. When you learn freediving from any fully insured and F.I.I.-certified instructor, you know you are getting the finest, safest freediving education—guaranteed. Pompano Beach, Florida

Global Underwater Explorers (GUE) represents a global network of GUE communities, empowered by highly refined diver training programs and inspired to explore and conserve the world’s aquatic environments. We are a leader in scuba education, having developed numerous industry-first training protocols and utilizing an elite cast of diving educators. GUE provides training for non-divers, recreational divers, cave and technical divers, and instructors from other agencies, all in an effort to elevate the quality of training within the dive industry. High Springs, Florida

IANTD Is The World's Largest Scuba Diving Training Organization Of Openwater, Nitrox, Enriched Air, Overhead Environment, Cave, Wreck, Rebreather, Trimix, Gas Blenders, Technical Scuba Divers, Instructors and Instructor Trainers. Our mission is to understand the opportunities and challenges of Nitrox, advanced and technical diving, in order to foster openness, individual responsibilities, and provide a standard of care for instruction in the diving community. Rapid City, South Dakota

International Diving Educators Association. IDEA was originally established in 1952 as part of the Florida Skin Divers Association, which later became Florida Scuba Divers Association (FSDA). Committee members of the original Scuba Training Committee decided that they had outgrown FSDA and a new name, a new logo and a new direction was forthcoming. In February of 1978, the members voted to expand the Scuba Training Committee to an International Certification Agency, based upon the same principles as the original committee. The International Diving Educators Association (IDEA) was officially formed.

The International Diving Educators Association (IDEA) was established in 1952 as the FSDA "Scuba Training Committee". IDEA is a founding member of the Recreational Scuba Training Council (RSTC)) and the World Recreational Scuba Training Council (WRSTC). All training offered by IDEA instructors is a academic and proficiency based scuba training. IDEA offers the most comprehensive scuba training available. As an IDEA scuba student you will receive safe and comprehensive training in classroom, water skills and open water training. IDEA is America's first scuba certification agency. IDEA International Headquarters is located in St. Petersburg, Florida

From its humble beginning in 1994 to today, the group of training agencies Scuba Diving International (SDI), Technical Diving International (TDI), and Emergency Response Diving International (ERDI) form one of the largest diving certification agencies in the World – International Training. With 26 Regional Offices servicing more than 100 countries, the company today far exceeds the original vision the founders had when they conceived the idea on a napkin, sitting at a kitchen table in the early 1990's. In 1998 the membership of TDI could no longer be held back from the demand to create a sport diving division of TDI and thus was born Scuba Diving International (SDI). Scuba Diving International (SDI) has its roots deep in advanced diving. It was created by professional educators, who know what it takes to educate qualified divers at all levels. Technical Diving International (TDI) is the largest technical training agency in the world. It was the launch pad for SDI, and Emergency Response Diving International (ERDI), which is the first global training agency for public safety divers. You will never outgrow the training opportunities offered by Scuba Diving International and its family of agencies.

Lifeguards Systems is the culmination of a life's work and the dedication to creating a safer world in the realms of Water Rescue and Public Safety Diving. Lifeguard Systems in the 21st century has taken large leaps in many different areas. Public Safety divers and surface water rescue personnel can now take any of 25 different programs that are of the highest standard world-wide. Fire Engineering/Pennwell Publishing published Surface Ice Rescue, Public Safety Diving, and Ice Diving Operations. TeamLGS founded RIPTIDE, a nonprofit organization, devoted to homicidal drowning investigation and research, recovery operations, and public safety diver and water rescue technician accident prevention. Besides the training of Headquarter instructors, LGS started teaching ten day Phase 1 Public Safety Diver Instructor Training Courses to certify those that were not able to do the long HQ internship programs. This ITC is the highest standards public safety diver instructor training course in the industry. Shokan, New York

NASE is the only scuba training organization to draw its extensive experience from the fields of commercial, recreational, technical and cave diver training. NASE's parent company, Commercial Diving Academy, is the world's largest commercial diving school. NASE Worldwide helps introduce the world to scuba diving by providing innovative scuba training materials and methods. We provide our members with a profitable business model that focuses on three key factors: safety, integrity and education. Flagler Beach, Florida

Information for Serious Divers. NAUI Worldwide is the world's oldest not-for-profit membership training agency organized solely to support and promote dive safety through education. The National Association of Underwater Instructors (NAUI Worldwide) has been teaching the world to dive safely since 1959. As the largest non-profit and most respected dive training and certifying organization in the world, NAUI offers a full range of training programs from Skin Diver through Instructor Course Director, with dozens of specialty courses including Nitrox and Technical diving. Riverview, Florida

Professional Association of Diving Instructors. PADI is the world's leading scuba diving training organization. With more than forty years experience, over 136,000 PADI Professionals and more than 6200 dive shops and resorts worldwide, PADI training materials and services let you experience scuba diving from nearly anywhere. Scuba diving with PADI Instructors, Dive Centers and Resorts can help transform your life through education, experience, equipment and environmental conservation. U.S. office is located in Rancho Santa Margarita, California

The Professional Scuba Association International is oldest technical / extended range scuba certification agencies in the world. PSAI was the first agency to offer certification at the diver and instructor levels in both recreational sport and technical diving, almost three decades before anyone else. Pigeon, Michigan

PSI, Inc. (Professional Scuba Inspectors), also now known as PCI, Inc. (Professional Cylinder Inspectors, Inc.) or together as PSI-PCI, was formed in 1982. Affiliate cylinder inspector instructors are located in more than 10 countries. Hundreds of hands-on visual inspector courses, training thousands of students, are conducted each year. Training by correspondence is offered to technicians at international locations not served by PSI-PCI instructors. PSI-PCI has a long history as the only agency for this training that is formally endorsed, utilized and referred to by the cylinder manufacturers; and recognized by law and rule making entities such as USDOT, TC and Compressed Gas Association. Burlington, North Carolina

scubageek.com (formerly The Physics Gearbag) is both authored and hosted by ReefNet. At first we thought that an FAQ for scuba physics would be a good idea, and still do, but this isn't it. Although we're interested in frequently asked questions, we're more interested in questions that are NOT frequently asked, but probably should be. Most of the following articles have something to do with being in, on, or near water (e.g. underwater photography). But some have nothing to do with anything --- we just find them interesting.

Scuba Schools International (SSI) is a world-wide leader in diving education that is dedicated to provide The Ultimate Dive Experience. SSI - Serious Diving, Serious Fun. For more than 40 years, SSI has provided training, scuba diving certification, and educational resources for divers, dive instructors, dive centers and resorts around the world. Started in 1970, SSI has expanded to include more than 30 Service Centers, is represented in more than 110 countries with over 2.500 International locations, and has materials printed in more than 30 languages. Ft.Collins, Colorado

One hundred and thirty feet down on a wreck in the North Atlantic or operating in black water feeling around in the mud for a missing child. Sport recreational diving? Not by a long shot. So why are you training in sport diving techniques? Sub Aqua Rescue Systems trains divers to operate safely and efficiently while undertaking extreme dives. We offer courses in all levels of technical, public safety diving, ice diving, surface ice rescue, and rescue swimmer. We have been training first responders for 25 years and are active members in public safety dive/water rescue teams. You could say we practice what we preach. We also teach all levels of courses for the recreational sport diver as well including Instructor training and certification. Courses are held at our locations in Florida and New Jersey or if your group is at least eight people any course can be held at your location. Naples, Florida

The World Recreational Scuba Training Council (WRSTC) is dedicated to the worldwide safety of the recreational diving public. As such, one of the WRSTC's primary goals is the development of worldwide minimum training standards. The establishment of globally recognized and implemented standards is a valuable asset in addressing local and national regulatory issues. Jacksonville, Florida