Flooded tunnel adit, part of the abandoned and unfinished Loharinag-Pala Hydro Power Project on the Bhagtrathi river (one of the headstreams of the Ganges river).
This is the adit to the tailrace tunnel.
View photo inside this tunnel.
For more info about the Loharinag-Pala Hydro Power Project, read en.wikipedia.org/wiki/Loharinag_Pala_Hydro_Power_Project.