I think most Open Water Dive certifications are to a recommended depth of about 18 metres / 60 feet, and Advanced Open Water Dive certificates are to a depth of about 30 metres / 100 feet.[1]
Thank you for linking to that. It would seem my knowledge is outdated by 17 years. I've noticed recently I've claimed knowledge of something only to realise it was circa 20 years ago, at which point I then loudly blurt out "Back in my day!".
I have a recreational dive certificate issued by NASDS Australasia in 2000. Looks like NASDS Australasia has since faded from view, and NASDS USA joined with SSI around 1999.
1. https://en.wikipedia.org/wiki/Advanced_Open_Water_Diver