The guides
There is the technique, there is the gear, and there is how you behave once you are underwater. These three things matter equally. Here is everything I have written on the subject, arranged so you can find what you need right now.
Eleven sheets explaining what really happens inside your camera, from the pixel to the RAW file, right through to the constraints specific to the underwater world. Read them in order or dip in as needed.
Open the technical sheetsA good image is never worth a disturbed animal. These guides set out the limits I hold myself to, and explain why.
What you can approach, at what distance, and the signals telling you to back off.
Read the guideWhy whoever photographs the ocean carries a particular responsibility towards it.
Read the guideA choice that often surprises, and the concrete reasons behind it.
Read the guideBefore buying gear or committing to a training course, a few questions deserve a real answer.
Photo or video, beginner or experienced, what really changes from one path to another.
Read the guidePulling a still from a video, does it really replace photography.
Read the guideHow far to correct an underwater image without betraying what you saw.
Read the guideReading helps, practice anchors. The tools are free and serve before, during and after the dive. The training walks with you over time.