The complete reference for scuba diving
Scuba Diving Training first, then the water.
How recreational diving is organised and why it starts with certification, what the training agencies and the ISO standards set out for each level, the gear and the standards it is built to, diving safety as the medical bodies publish it, and how the sport began.
Everything, in one place
browse A–Z →Learn
How scuba works, why certification matters, the training agencies and ISO standards, certification levels, medical screening and how people start.
Fundamentals 02Equipment
Masks and fins, wetsuits and dry suits, BCDs, regulators, dive computers, cylinders and their testing, and travelling with gear.
Gear 03Safety
What the accident data shows, diving illnesses, flying after diving, fitness to dive, buddies and protecting reefs, as the bodies publish them.
Safety 04Places
How dive sites and wrecks are protected: marine parks and their rules, as each managing authority publishes them, and wreck law in the UK and the US.
Rules 05History
From early diving apparatus to the Aqua-Lung, the founding of the training agencies, the first dive computers, nitrox and women in diving.
Heritage 06Gear Guides
Masks and fins, wetsuits, BCDs, regulators, dive computers, lights and travel gear, by category and use.
GuidesCylinder due for a test? Check the test intervals → · New to diving? How people start →