Unexplained shutdowns at US nuclear missile bases during the Cold War are back in the spotlight after a former NASA scientist revisited the incidents in a widely shared podcast interview.

Dr Kevin Knuth, a physicist and former researcher at NASA's Ames Research Center, discussed historical accounts of unidentified anomalous phenomena (UAP) appearing near military installations, including reports that missile systems became temporarily inoperable during those encounters.

The discussion, featured onMayim Bialik's Breakdown, has renewed attention on decades-old testimony from US Air Force personnel. However, no publicly available evidence confirms that UAPs interfered with nuclear systems, and official investigations have not reached that conclusion.

Much of the discussion centres on reports from the 1960s, including a widely cited incident at Malmstrom Air Force Base in Montana in 1967. Former Air Force personnel have said multiple Minuteman missiles became inoperable while a glowing object was observed near the facility.

In the podcast, Dr Knuth referred to testimony from former officers describing guidance system failures occurring at the same time as reported sightings. He said such accounts have been repeated over decades, contributing to speculation about a possible link between UAP activity and nuclear infrastructure.

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He also emphasised that it remains unclear whether any interaction, if it occurred, was intentional or coincidental, and said technical faults or other forms of interference should be considered.

Dr Knuth said some reported UAP flight characteristics, including high speed and acceleration, appear difficult to reconcile with current aerospace technology and warrant further study.

At the same time, he acknowledged the limits of the available evidence, noting that much of it is based on anecdotal testimony that cannot be independently verified. He added that many sightings are likely to have conventional explanations, including misidentified aircraft or natural phenomena.

US defence authorities have consistently stated that there is no verified evidence linking UAPs to non-human intelligence or to interference with nuclear systems. ThePentagon's All-domain Anomaly Resolution Office (AARO), which reviews historical and current UAP cases, has said that many reported incidents can be explained by airborne objects, sensor anomalies or incomplete data.

Source: International Business Times UK