Diving for 43 years. Started with a Nikonos II and an underwater flashbulb strobe.
Then a Nikonos-V.
Then a Nikon N90 in a Nexus housing.
Then an Olympus 4040 (digital!)
Then a Nikon D70.
Then a Nikon D300 in a Sea & Sea housing. It's old, but so am I.