When did an avalanche hit a Pakistan Army base in which 140 soldiers and civilian contractors martyred?

On April 7, 2012, a devastating avalanche struck the Pakistan Army's Gayari Sector base near the Siachen Glacier, burying 140 individuals—129 soldiers and 11 civilian contractors—under deep snow. The incident occurred at an altitude of approximately 4,000 meters in the Gilgit-Baltistan region of northern Pakistan. Despite extensive rescue efforts, no survivors were found, and all victims were declared martyrs by the Pakistan Army. This remains the deadliest avalanche in the history of the Pakistani military