India-based Neutrino Observatory (INO)

The INO will be a major underground experimental facility to study the elusive and nearly mass-less fundamental particles of nature called neutrinos,
The Singara site which, according to scientists, is the best spot to locate the INO, was rejected by the MoEF on the grounds that it was not cleared by the Tamil Nadu Forest Department (TNFD). It was stated to fall in the buffer zone of the Mudhumalai Tiger Reserve. The site being close to the elephant corridor between the Western Ghats and the Eastern Ghats was also a consideration.

Two-km tunnel

The proposed massive neutrino detector will be built in a cavern set in massive charnockite rock (group of igneous rocks found in South India with those in Tamil Nadu known to be the hardest). The cavern will be excavated by drilling a tunnel of 1.9-2 km in length under the peak designated as 1589 so that there is vertical overburden of about 1,300 m. For a good neutrino detection facility, a vertical cover of at least 1,000 m is required so that the observed neutrino events are not contaminated by unwanted particles that will be absorbed by the overburden.

The INO includes nearly 90 scientists from 25 institutions, with the TIFR as the nodal institution.

Neutrino:

Is an elementary particle that usually travels close to the speed of light, is electrically neutral, and is able to pass through ordinary matter almost undisturbed. This makes neutrinos extremely difficult to detect. Neutrinos have a very small, but nonzero mass. They are denoted by the Greek letter ν (nu).