Navy team measures depth of glacial lake in Uttarakhand's Tapovan Updated: Updated: February 21, 2021 17:07 IST The operation by the naval divers took place at a height of 14,000 feet above the mean sea level. Share Article AAA NDRF personnel on February 19, 2021 carrying out rescue and restoration work at the flash floods-hit Tapovan area in Chamoli district of Uttarakhand. | Photo Credit: PTI The operation by the naval divers took place at a height of 14,000 feet above the mean sea level. In a joint operation, an Indian Air Force Advanced Light Helicopter (ALH) winched Navy's divers to measure the depth of a glacial lake formed upstream of Tapovan in Uttarakhand following the devastating flash flood, the Navy said on Sunday.