A lost nuclear-powered spy device remains hidden within the high peaks of Nanda Devi.

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: High in the Himalayas, a Cold War relic lies buried beneath glacial ice. During the 1960s, a joint US-Indian mission attempted to place a nuclear-powered listening device on Nanda Devi to monitor Chinese missile tests. The mission failed, the device vanished, and its potential environmental impact remains a lingering concern.

Established in 1982, Nanda Devi National Park is a high-altitude sanctuary in India’s Uttarakhand state, where the entire landscape sits above 3,500 meters. The park is defined by the Nanda Devi Sanctuary, a glacial basin encircled by formidable peaks ranging from 6,000 to 7,500 meters. This rugged terrain, drained by the Rishi Ganga, remained largely impenetrable to early explorers until Eric Shipton and H. W. Tilman successfully navigated the Rishi Gorge in 1934.

The park’s history took a clandestine turn during the Cold War. Following China’s 1964 nuclear test, the CIA and India’s Intelligence Bureau collaborated on a secret operation to install a nuclear-powered sensor atop Nanda Devi to track missile telemetry. Adverse weather forced the team to abandon the plutonium-fueled device on the mountain. When they returned the following season, the equipment was gone, likely swept away by rockfall into the glaciers below. Decades later, in 2018, local officials expressed fears that the missing device might be contaminating the headwaters of the Ganges.

Beyond its geopolitical intrigue, the park is a vital ecological zone. It is part of a larger biosphere reserve and was inscribed as a UNESCO World Heritage Site in 1988. The environment is harsh; the inner sanctuary is so dry that vegetation is scarce, though the broader park supports diverse species, including Himalayan musk deer, snow leopards, and over 300 types of flora. In February 2021, the region faced a severe natural disaster when a glacial lake outburst flood caused significant destruction along the Rishiganga river, highlighting the volatile and shifting nature of this high-altitude wilderness.

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