They don't look altered to me. Some special filter on camera are applied, of course, but doesnt seem any Photoshopping was involved. Of course water is THIS cl

They don't look altered to me. Some special filter on camera are applied, of course, but doesnt seem any Photoshopping was involved. Of course water is THIS clear when you dive in most cold waters, given Antarctica. Lower temperatures make less stuff to bloom in water so no living material to "soil" the water body; and also lower temps. add clarity - same as colder air makes objects look sharper. Experience: diving across European cold waters since 13; taking semi-pro photos since 19 yrs old.