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Here's a look at the pieces of the water cooling system for the K Computer.
The 6-dimensional mesh/torus topography is described by Fujitsu:
"The design of the 6-dimensional mesh/torus topology in the K computer means there are many communication routes between neighboring CPUs. This enables the execution of data communications between CPUs via the shortest route and over the shortest period of time and ensures the network can fully draw out this world top-class CPU computational power."
Here is China top supercomputer which was built in 2010 and is located at the National Supercomputing Center in Tianjin. China place second to the U.S. with 62 supercomputers on the Top 500 list.