The Diveheart Foundation for scuba diving with disabilities.

Mental benefits of experiencing awe by Dacher Keltner: "Awe: The New Science of Everyday Wonder and How It Can Transform Your Life."

A Blue Mind by Wallace J. Nichols: "Blue Mind: The Surprising Science That Shows How Being Near, In, On, or Under Water Can Make You Happier, Healthier, More Connected, and Better at What You Do."

"National Geographic Ocean: A Global Odyssey" by Sylvia Earle.

The surface-supplied air (tankless) diving unit I use from BLU3.

Dive industry surveys & market reports by The Business of Diving Institute.

The ASK4Q project.

The International Shark Attack File.

Scuba diving participation in the USA.

Special considerations when diving at altitude.

More information about oxygen toxicity when scuba diving.

Dangers of carbon monoxide (CO) poisoning.

More information about Immersion Pulmonary Edema (IPE).

A worldwide list of dive training agencies.

If you want to get a feel for the theory part of a scuba diving course before having decided on a dive instructor, you could start a free online entry-level scuba course like the one offered by RAID. But be aware that you will have to redo the academics portion of your scuba certification course with the training agency of your chosen dive instructor.

As promised, a form to help you evaluate the total cost of an open-water diver certification course from different dive centers & instructors. Available in three formats:

• a PDF form: print one page per dive center/instructor, then compare the totals.
• a spreadsheet file (XLS) with totals automatically calculated. The XLS comes in a zip file. Simply unzip it!
• an online Google Sheet. If you have a Gmail or Google account, you can "make a copy" and then work with it.

PADI Standard Safe Diving Practices Statement of Understanding.

More information about women's health and scuba diving.

About menstruation and scuba diving.

Diving with disabilities: Diveheart Foundation, Handicapped Scuba Association (HSA) & International Association for Handicapped Divers (IAHD).

Divers Alert Network (DAN) regions:

• DAN Europe: The countries of the Mediterranean Basin, the countries on the shores of the Red Sea, the Middle East including the Persian Gulf, the countries on the shores of the Indian Ocean north of the equator and west of India and Sri Lanka, as well as the related overseas territories, districts, and protectorates.
• DAN USA: USA & Canada
• DAN World: the Caribbean (Puerto Rico, Bahamas, British & U.S. Virgin Islands), Micronesia, Melanesia, Guam, Central, and South America, including Brazil.
• DAN Asia-Pacific: Australia, New Zealand, South Pacific islands, Indonesia, Polynesia, Southeast Asia, India, China, Thailand, Taiwan, and Korea.
• DAN China: Mainland China, Hong Kong, Macao, and Taiwan.
• DAN Japan: Japan, Japanese islands & related territories, with regional responsibility for Northeast Asia-Pacific.
• DAN Southern Africa: South Africa, Swaziland, Lesotho, Namibia, Botswana, Zimbabwe, Mozambique, Angola, Zambia, Zaire, Malawi, Tanzania, Kenya, Madagascar, Comoros, Seychelles, and Mauritius.

Dr. Laura Walton's online course on mental rehearsal for scuba divers.

Medical screening & questionnaire for recreational scuba diving.

Ear equalizing techniques:

• Valsalva vs. Frenzel methods of ear equalization: This video was recorded by Ted Harty for freedivers but trust me! It provides valuable information & tricks.
• DAN USA's 6 methods to equalize your ears.

DAN Europe's advice on nutrition for scuba diving.

DAN USA's extensive review of your heart health vs. scuba diving.

The calf raises exercise.

Dr. Laura Walton's free online mini-course on panic and scuba diving.

Disinfecting dive gear:

• Tec Clark's video on properly disinfecting dive gear.
• DAN USA's guidelines on disinfecting dive gear.

Fitness to dive after COVID:

• Guidance on returning to recreational scuba diving after COVID from the UK Diving Medical Committee (UKDMC).
• DAN Europe's guidelines to determine fitness to dive after COVID.

Video of colors disappearing underwater as you go down.

Mask for scuba diving:

• Selection for proper fitting.
• Tec Clark's two-part video on pre-treating (preparing) a dive mask for first use after purchase: part one & part two.
• Reef-friendly mask defog solution.
• Attaching the snorkel with a proper angle.

DSMB deployment methods: the good & the bad.

A video providing an overview of GUE's Fundamentals course.

"Compliance Provides an Illusion of Safety in Diving" by Gareth Lock.

Video on five scuba diving fin kicks.

Eric Douglas' "Lessons For Life" series.

DAN courses (unfortunately, not all courses are available in all DAN regions listed under Chapter 4):

• Emergency planning & preparing an emergency action plan (EAP).
• Emergency oxygen provider for scuba diving injuries.
• First aid for hazardous marine life injuries.

"How do I Improve My Situation Awareness?" in The Human Diver.

Find a Professional Scuba Inspector (PSI) inspector or instructor.

Carbon monoxide detectors:

• Check the "CO Clear" inline unit (way down the page). It would be good to see it on the compressor used to fill your scuba cylinders.
• Single-use personal air test kit by PSI.
• A portable CO analyzer designed for scuba diving by Analytical Industries.

And a portable nitrox analyzer by the same brand. There are many good models available on the market.

An up-to-date, complete guide for scuba divers by Alex Brylske: "Beneath the Blue Planet: A Divers Guide to the Ocean and Its Conservation." I wish I had had that book when I started scuba diving!

The series of fish & creature identification books I couldn't live (dive) without:

• Reef Fish Identification: Florida, Caribbean, Bahamas.
• Reef Fish Identification: Tropical Pacific.
• Coastal Fish Identification: California to Alaska.
• Reef Fish Identification: Baja to Panama.
• Reef Fish Identification: Galapagos.
• Reef Coral Identification: Florida, Caribbean, Bahamas.
• Reef Creature Identification: Florida, Caribbean, Bahamas.
• Reef Creature Identification: Tropical Pacific.

The Green Fins organization and its online course on how to minimize our impact on the underwater environment.

DAN's online course on environmental stewardship for divers.

An organization mobilizing scuba divers to record data on changes in the underwater world: Project Baseline.

An example of a reef-safe sunscreen.

Reference book for scuba diving hand signals.

The Reef Smart guides are, by far, the best travel guides ever written for scuba divers. I can't wait for them to add to the list of destinations they have covered so far:

• Barbados
• Bonaire
• Florida Keys
• Fort Lauderdale, Florida
• Grand Cayman
• Northwest Florida
• Palm Beach, Florida

"Learning From Others' Mistakes" by Gareth Lock.

"Become a DAN Prepared Diver" online course.

My book "Your Career and/or Life as a Scuba Diving Instructor: How to make a good living out of your passion for scuba diving."

An online publication if you are interested in the dive industry: Scubanomics.

An online publication if you are interested in tech diving: InDepth.

And... Scuba diving novels (my favorite ones) for your surface intervals!