[crooked-v]

As someone else with similar issues, I'm pretty deeply aphantasic. The best mental visualization I can manage of even simple imagery (think "a red triangle on a black background") is roughly comparable to a half-transparent blurry watercolor, and I can't clearly picture faces at all (though I don't have any particular trouble with recognizing people when I see them).

[underwater]

Is that really aphantasia? I understood it to be the absolute absence of any mental imagery. Your description actually sounds similar to my own experience. I'm capable of summon up imagery with effort when I need to, but it's never very clear or frequent.

[amanaplanacanal]

My visualization is somewhere between wireframes and chalkboard diagrams, usually closer to the later. Also have little autobiographical memory. I suspect I’m somewhat on the autism spectrum, but that wasn’t diagnosed much back in the 60’s when I was growing up.