Tears of joy rolled down the cheeks of 25-year-old Abhisekh Panwar, a trekker and guide, after he and five other teammates discovered a crystal clear lake at an altitude of around 16,000 feet in the picturesque Rudraprayag district of Uttarakhand. The mutual interest in high-altitude trekking brought together six youngsters in their mid-20s — Abhisekh, Aakash, Vinay, Lalit Mohan, Arvind, …