Priming for a cave-in

The above photograph is of a section of the NH 31A in Gangtok. It is not just a ditch common to the stretches where the fresh black-topping has not reached yet and is one which a superficial layer of tarmac will not save. This is a cave-in in the making at Tadong near the Police Check-Post. The sink sits directly above a major jhora and is already deep enough to trouble even a bus engine. When the bottom gives away here, it will leave a gaping hole staring straight into the jhora below. Thus far, no agency appears to even have noticed it, repairs thus are still awaited....