There are still a few installations around running DCS / SCADA in power stations, refineries etc. We used to put VAX clusters in to run the databases, and used an OS/2 front end for the graphics. In its day (early 1990s) it was miles ahead of anything x86 and many have continued running since then without crashing.
When working on Desalination plants one must allow a certain amount of "raw" or semi treated water to mix with the output from the Reverse Osmosis (RO) trains before distribution. I am not a biologist but my understanding is that pure water pulls ions, salts etc out of your body and will kill you if you do this for too long.
My observation of this was receiving 10+ infected emails a day from a large Australian water utility that for some retarded reason used Symantec "AV". Lucky I was using a free client on my end. Symantec is rubbish. If you pay for it you are misinformed. Avast!
EDT on VMS. That thing was awesome. Sure I ran it on a crappy VT100 from various Vaxen over the years (all sadly long gone) but damn it was intuitive and had awesome macro capabilities. We used to write big RTU control scripts using the function keys. Closest thing I've come across since is Ultraedit. Anyone out there know of a modern EDT clone ?