From the interview content (the line from Mr. Singh ' I don t know when it was occupied, could have been 1984) points to inadequate surveilance from the Indian side only. It seems they were complacent the glacier coul dnot be occupied or Pak did not have the wherewithal and intention to do that. In other words India was caught napping and the nap actually was deep slumber fro three years. No doubt Pak got very bold after that and J&K turned into the nightmare it is. Wonder if at least aerial surveliance could have given some prior knowledge.
