Ahoy, in South Africa we can get trained up to ClassII
The best school as far as my knowledge goes is this one:
Commercial Diving School South Africa - wccds - Home
Got a classIV, but would still like to go all the way some day, unfortunately I just started a job in aquaculture, so my diving has been seriously curtailed, considering I spent more time in water than on land...what an adjustment this is going to have to be!!
Goodluck!