An Indian Express team begins a trek to Siachen and keeps you posted, every day.

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Reaching it involves a bone shaking four hour drive from Leh but the first glimpse of the incredibly blue Pangong Lake is a sight for sore eyes. Nestled between India and China at an altitude of 14,500 feet, the salt water lake with its various shades of blue is a photographer's delight.

However, the deceptively calm Pangong Lake – or Lukung lake as it is known among locals - is also one of the key border flashpoints between India and China that is waiting to explode. The area under contention is a 5 km stretch along the lake that both sides lay claim to.

Things deteriorated in 1999 after China, taking advantage of Indian Army's buildup in Kargil, built a 5 km permanent track into Indian Territory along the lake. Both sides now carry out routine patrols on the track and mark their presence but avoid physical contact.

While the frequency of incursions by Chinese troops on Indian Territory in and around the lake has not increased over the past few years – three to four incidents of transgression on both land and water are reported every week - the calm is still very much only on the surface.

On the lake itself, 45 km of which is in India while the remaining 90 km lies in China, both sides carry out regular patrols. While the standard drill when two boats from opposite sides come face to face is holding up flags saying "Hindi-Chini bhai bhai" by soldiers from both countries, the subdued aggression sometimes comes to surface.

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