The neighbours have a refrigerator that’s guarded 24×7 by a grad student in spite of the fact that there never is any ice cream in it.
It can cool its contents to around 10mK , subject to heat load .
Designed by Oxford Instruments, this dilution refrigerator uses a mixture of He-4 and its isotope He-3 to achieve such low temperatures. It’s a closed system (He-3 isn’t cheap :p) , and the liquefiers and compressors are situated in a chamber adjacent to the lab.
The research carried out using this setup deals mostly with mesoscopic devices such as nanomechanical resonators. IISER Mohali also has several fabrication facilities.