Indian technical experts, who have been monitoring this structure closely, have opined that it could be a radar station which apparently did not exist before. However, no signal has been emitted or received so far.
The work on this structure was expedited by the Chinese after IAF made a surprise historic landing of its C-310J Hercules on a military air strip in DBO on August 20 this year.
The matter was raised at the border meetings during which the Chinese side claimed it was a weather station, a statement which the Indian side contested as there was no civilian population in the area.
The DBO air strip had been activated after 43 years in 2008 when an AN-32 transport plane landed there.
However, after the landing, the transport plane was used only for air dropping material for troops of Army and ITBP, manning the hostile terrain in this region.
Hercules has made at least seven landings so far in the area, the sources said. It is capable of carrying up to 20 tonnes of load.
In a related move, Chinese troops mounted on vehicles entered five km deep into Indian territory at Trade Junction area in North of Ladakh.
However, there was no face-off as the Chinese troops pulled back on their own, the sources said.