In 1970, we did ditch and don from, and then to, the bottom of the pool, as part of a LA County class
I was required to do a ditch n don (dump gear, swim to the surface, swim back down, put gear back on) as part of a NAUI OW course in 1981. I was also required to do a skin ditch (mask, fins, snorkel).
Not sure if that was part of the standards or if my instructor made us do it.