Arty computers

On the subject of systems that are all pretty skin and no guts, does anyone remember the direct-contact water-cooled Honeywell mainframe? I got to see it in development at the old GE plant in Phoenix back in the 70's. Interesting operator's console with bar-graph Nixie displays. The CPU itself was separate and was a hoot. The outer cabinet was pretty much a walk-in "shed" that held the floor-standing racks containing the PCBs with cooling interconnects made of what looked to be vinyl tubing. I was told that the big problem of the day was algae in the cooling lines and the engineers were checking out additives that would inhibit algae growth but tnot corrode the copper contact plates. The old GE machines with the "Thousands of Operations Per Second" analogue meters were kind of neat too. Cheers, Chuck