The UNK proton accelerator is an uncompleted project of 3 TeV large superconductor-based particle accelerator in Protvino, near Moscow, Russia, at the Institute for High Energy Physics.
[1][2] The U-70 synchrotron commissioned in 1967 was supposed to act as an injector for the UNK proton-proton collider ring.
In eleven years, a 21 kilometer long, 5 meter wide underground tunnel was completed, as well as a 2.7 kilometer long tunnel connecting U-70 with UNK.
Electromagnetic, vacuum and surveillance equipment was mounted.
[citation needed] As the similar project has been already commissioned at CERN, the Russian Government has decided to direct the particle physics funding to another accelerator project – NICA.