In yet another grim reminder of the harsh conditions that the Indian security forces operate in the Siachen glacier, eight people -- part of a patrolling party -- including soldiers of the Dogra Regiment, were trapped in snow for hours after being hit by an avalanche on Monday.

Trapped at a height of between 18,000 and 19,000 feet above sea level, four soldiers and two civilian porters succumbed to “extreme hypothermia”.

At the Siachen Glacier, more than anything else, luck plays a major role in survival. Equipment and training are in plenty but people need more than just that for survival.

A few things need to be placed in perspective for the public to glean what glaciated operations really mean. And I won’t start the traditional way, by relating how Siachen became an issue between India and Pakistan

The Siachen Glacier, 75 km in length, is a river of snow/ice, many hundreds of feet deep. Its ‘snout’ is where the base camp of the Indian Army is. It is not really flat but compared to the high mountains on its flanks it is almost like a table top.

The Army occupies the glacier with its bases, smaller camps, headquarters and artillery gun positions.

We are at a major advantage over the Pakistan Army since we occupy the western ridge of high mountains called the Saltoro Ridge and therefore deny Pakistan Army any peep on to the Siachen Glacier. However, that makes the task of deployment far more difficult as much as it affects the logistics of maintenance.

Coming down from the Saltoro Ridge towards the main glacier are a number of sub glaciers; these facilitate the routes and camps that support the deployment of the Indian Army at the Saltoro.

The deployment is on razor-sharp peaks and ridges where the construction of any shelters becomes near impossible. The final ascent to the deployment areas is sometimes done by the use of ropes over vertical ice walls.

As few as two to six men may remain at a post because there isn’t space for more. Snow caves are used in some cases. There are small snow-beaten helipads on the main glacier and at logistics hubs at the sub-glaciers (for example, the Bila Fond La glacier).

However, the helipads that need to be seen to be believed are tucked away on the Saltoro Ridge in nooks and corners. Helicopters are the lifeline to this region because they transport radio batteries, kerosene oil, tinned food, and special rations besides letters from home.

The system works something like this usually. Kerosene and other bulk loads are packed at Base Camp and loaded onto Mi-17 helicopters (the medium-sized helicopter). They are para dropped at the designated dropping zones (DZs) on flat portions of the glacier, near the logistics hubs.

It is not easy for the Mi-17 to hover at those altitudes. The dropped loads are collected with the help of snow scooters and sledges and taken to a bulk-breaking-point in the hub. An oil pipeline to at least one bulk-breaking-point also exists and is a marvel of innovative engineering.

The lighter helicopters arrive from Base Camp with a few luxury loads like mail and a few fresh items. These helicopters deliver the initial stores and then ferry kerosene oil, men and other material between the hubs and the posts on the Saltoro Ridge.

There are small detachments that receive these stores, oil, food and mail and send them ahead to the smaller posts through patrols.

The number of flights from bulk-breaking-points to forward helipads could be as many as 10-12 a day with the first one or two sorties carrying just a jerry can of kerosene oil due to the bulk of their own weight of fuel. This is how life goes on at the icy heights.

Everything is contingent upon the weather. For days on end, no helicopter may fly; which is why it is important to stock up reserves whenever the weather is good.

Movement of snow scooters and patrols -- or links as they are called -- also cease the moment the weather deteriorates because navigation even for a few meters becomes extremely difficult.

It is on one such post near a helipad at the Saltoro Ridge that the ice wall has collapsed and come cascading down on the 10-man post that existed there for the purpose of receiving and distributing supplies.

Ice walls are usually not susceptible to collapse but higher up when there is excessive snowfall, ‘overhangs’ are formed. These are also called ‘cornices’ and as they become larger they threaten to come down the moment the weather turns a little warmer by day. There are thousands of such cornices but not all of them collapse.

Sometimes, experienced mountain men fire rockets or automatic grenade launchers to loosen the cornices and allow them to come cascading down in a controlled way.

However, this procedure is not an easy one, especially if there are troops residing at the top of the ice walls where the cornices have formed. Rockets also perform in unpredictable ways in the rarefied atmosphere.

The science of prediction of avalanches has not reached that level where it can predict the exact location where they may occur.

The Snow and Avalanche Study Establishment (SASE) at Manali has many of its detachments in Ladakh and Kashmir but its capability is restricted to generic warnings about areas where avalanches could occur. The entire Siachen area usually falls within that location.

The Indian Army’s avalanche drills are well established. However, if 30 feet of snow crashes down on a post in an isolated area where movement in winter is only possible by helicopter, rescue becomes a nightmare.

Even if 10-15 men can be inducted, their very survival also gets threatened due to lack of cover, icy working conditions and limited working efficiency.

The question is can some of these posts be evacuated for winter and reoccupied in summer (just like the concept elsewhere, where winter vacation is a norm)? By trial and error, the Indian Army has established patterns of snow activity and accordingly there do exist some posts that are vacated during winter.

However, despite ceasefire (and an effective one too) risks cannot be taken. This essentially means we can take no chances with our Pakistani brethren, for they may well be found occupying such a vacated post of ours when we return after winter.

Why is the potential occupation of a winter vacated post by the Pakistan Army fraught with danger? This is important to know if you wish to understand the entire concept of the Indian Army’s deployment.

Currently, the Pakistan Army occupies the Konduz Glacier which is lower and almost parallel to the Siachen Glacier but separated from it by the Saltoro Ridge.

To get to the Siachen Glacier or train observed artillery fire on to it, the Pakistan Army needs to perch itself with a toehold on the Saltoro. That toehold can then be expanded to form a firm base for the conduct of further operations.

In various attempts from 1984 till 2003, the Pakistan Army has made valiant efforts to dislodge us and secure that toehold, but have failed. Pervez Musharaf, in his avatar as an SSG commander, is known to have guided some of these attempts in 1987-88.

Then the ceasefire was declared on 26 November 2003 and on the Siachen Glacier, it has been held most effectively. The Indian Army can take no chances by losing ground of such importance at the Saltoro heights and hence has to occupy even some well-known avalanche-threatened areas.

Life threats are not limited to avalanches and snow slides. The temperatures, going as low as -53 degrees C, combined with low oxygen levels at 18,000 to 22,000 feet create an acutely uncomfortable environment.

Headaches, insomnia, lack of hunger and bowel movement, all reduce human efficiency and in some cases leads to enlarged hearts and High Altitude Pulmonary Oedema (HAPO). While special rations are provided to troops, their consumption is unpredictable and based upon individual responses.

The next life-threatening phenomena are ‘crevasses’. These are large chasms in the frozen river of ice that are temporarily iced over by the prevailing cold conditions. By day, as the sun rises the temperatures also rise unexpectedly, making the iced-up covers of the crevasses dangerously thin. Men have been known to have disappeared into these crevasses never to be recovered.

And that is why all movement on the glacier is done with a minimum strength of six persons, all of whom have to be trained and roped up for survival should they encounter crevasses.

For sheer interest, readers would do good to read a story online at this link. It is all about a patrol that suffered the trauma of a soldier fallen into a crevasse.

One fact being misreported by the media is the length of stay of a soldier and his unit on the glacier. The rule is no soldier should spend more than 90 days on the glacier; this does not include the period spent in training and induction, which may extend to two months or so.

An infantry unit spends six months on top and its period of reconnaissance, training, equipping and deployment is usually one year. Depending on weather conditions, sending the relieving troops sometimes gets delayed, forcing officers and troops to spend longer than the mandated periods on the heights.

The reported figure is 890 lives lost by the Indian Army on the Siachen Glacier with hundreds more maimed by frostbite and other such accidents or by enemy action in the past. The estimated cost of maintenance of the Indian Army’s deployment on the Siachen Glacier is approximately Rs 4 crore a day.

Is it worth holding a piece of land where not a leaf nor a blade of grass grows? We have held it since 1984 and Pakistan has been desperate to evict us from it since then; there obviously has to be a strategic advantage that will take some explaining.

The Pakistanis term it ‘low hanging fruit’ -- ready to be plucked for a negotiated agreement. They too lost 138 soldiers in a devastating one kilometer long avalanche on the Gyari deployment in 2012. The desire for a negotiated settlement has gained weight since then.

A second part to this essay will be needed to analyse whether the fruit is really hanging so low or is it our gullibility that Pakistan wishes to exploit. The necessity for India to hold the glacier, as it does, and occupying the Saltoro Ridge in strength can be read here.

A version of this piece was published in February 2016.