Nice DuSlate! Mala is my favorite shore dive site on Maui.
Yes, the slate was pretty cool. It was the DM's slate. If they were easier to come by, I'd probably buy one. This was off the Maui Diamond boat at the St. Anthony wreck and tire reef.
I did dive Mala as well. Not as clear as I have done before but a very nice dive with LOTS of turtles and a few white tips