The Cray-2 (1985) supercomputers featured 'liquid immersion' cooling - the cubes of processors were dropped into a bath of inert oil [1][2][3]. [1] http://en.w

The Cray-2 (1985) supercomputers featured 'liquid immersion' cooling - the cubes of processors were dropped into a bath of inert oil [1][2][3]. [1] http://en.wikipedia.org/wiki/Fluorinert http://en.wikipedia.org/wiki/Fluorinert [2] Seymore Cray speaking about liquid cooling http://www.youtube.com/watch?v=QTfi_gNPuh0&list=FLZwq3blS9UIN2JpCl_2V4jw&t=14m40s http://www.youtube.com/watch?v=QTfi_gNPuh0&list=FLZwq3bl... [3] Visible cooling fluid within a 90s era Cray at the NSA: http://www.youtube.com/watch?v=BH8X8w8a4f4#t=23s http://www.youtube.com/watch?v=BH8X8w8a4f4#t=23s