After staying at Mr Namgyal's place, next morning we planned to visit the hidden water tunnel that was discovered recently.
The tunnel was discovered by a local who was digging the place for a different reason. Looking at the shine from the water below, he initially thought it was precious and dug deeper to finally find the water tunnel. It seems the tunnel was used in the past as a water reserve during winter. The water in winter was warm and Stanzin told me it's cold during summer. Amazing natural storage.