In 1967, a mission installed a monitoring device near the summit of Nanda Kot, a 22,000-foot peak nine miles southeast of Nanda Devi.
Notes on verification
Confirmed by multiple independent sources including a dedicated Wikipedia article, Indian media citing a named participant's firsthand account, and other historical summaries. All key facts (year, location, elevation, distance/direction) corroborate closely with only minor rounding discrepancies. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.75 clusters=4 claim_tier=notable | framework convergence=partial (upstreams: M.S. Kohli's 2012 account in the Indian Police Journal, declassified CIA/US State Department 1978 acknowledgment) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- How the United States Lost a Nuclear Device and Recovered an Indian Friend (seed:military_and_intelligence)
- https://m.thewire.in/article/security/inside-the-nanda-devi-nuclear-spy-mission-what-the-nyt-revisited-and-what-it-missed/amp (corroboration)
- https://www.livehistoryindia.com/story/eras/nanda-devi-nuclear-device (corroboration)
- https://www.eurasiantimes.com/cia-ibs-joint-mission-to-snoop-at-chines/ (corroboration)
- https://grokipedia.com/page/Nanda_Devi_Plutonium_Mission (corroboration)