Divers use WWII-era equipment for USS Arizona interment

I haven't dived in a decade or longer, but isn't most of the technology the same as before WWII? While I haven't ever seen a double hose regulator, the stuff all works like the rig that Cousteau invented before WWII. The new dive helmet works the same as the old one. Outside of Dive Computers instead of analog gauges, most of the equipment isn't much different, with the exception of some of the rebreather rigs.