Lohagad Fort sits above the Indrayani valley in Maval taluka, roughly 50 kilometres from Pune, Maharashtra. A popular weekend trekking destination, the fort draws visitors through most of the year, and in the weeks before and after the monsoon, the approach path fills with groups from across the Mumbai-Pune corridor.

On the morning of June 18, Ketan Agarwal, 26, the director of a Pimpri-Chinchwad real estate firm and the son of Vishal Agarwal, a businessman in construction, was among those who climbed its stone steps. He had come to celebrate the birthday of his fiancée Siya Goyal, 20. He did not return.