Explanation:

The project aims at building a world-class underground laboratory with a rock cover of approximately 1200 meter. Its mandate is to conduct basic research on elementary particle called neutrino. It is jointly supported by Department of Atomic Energy (DAE) and Department of Science & Technology (DST), with DAE acting as the nodal agency.
Justification: Statement 1 and 2: The observatory (neither neutrinos) emits harmful radiation. In fact, several neutrinos pass the human body every second.
Statement 3: The observatory will be located underground in order to provide adequate shielding to the neutrino detector from cosmic background radiation.
It will comprise complex of caverns which will house detector which is 130 metres long, 26 metres wide and 30 metre high.
Along with main cavern, there will be two smaller caverns that will be used for setting up experiments for neutrino double detector and dark matters. The non-accelerator based high energy and nuclear physics underground research complex will be approached by a 2-kms long tunnel.
The project also envisages construction of 50,000 tonne magnetised iron calorimeter detector (ICAL). It will study the properties of the neutrino, in particular the mass hierarchy among different types of neutrino.