MOST OF THE PHOTOS USED ON POSEIDON’S WEB are my own, taken during some 25 years of diving around the world (and, say 15 or so of serious photography).
It should be easy to perceive that both my equipment and skills have evolved over time.
PUBLIC DOMAIN
I also use photos that are in the public domain, either from the National Oceanic and Atmospheric and other government agencies, and from Wikimedia Commons, where generous photographers from around the world have shared their images for free, public use. Wikimedia Commons images are used under the Creative Commons licenses granted with each Wikimedia Commons image.
I always seek to give credit to the photographer, whenever possible. I occasionally, with their permission, use photos from other photographers, giving credit to them.