This is a terrific article with some great images and good info for prospective divers. I'd like to give a shout-out to Don Silcock for his article that was published recently here:
https://animamundimag.com/wp-content/uploads/2019/05/AM-Issue35-144.pdf
Don, if you're out there, thanks a lot!
(and for those that are not aware, Anima Mundi is a wonderful source of inspiration)