No longer current, previously a PADI OWSI, and can strongly recommend PNG if you’re suitably cashed-up, have lots of time, and like adventure. I lived and worked in Port Moresby for three years, and whilst SWMBO Golfed, I got wet ... usually two, sometimes three, dives on each day of the weekends, and numerous mid-week night dives. There are a couple of live-aboards operate around the north/islands who are well-regarded, but most of my dives were done around POM.