Case file · Anomaly hotspot

The Soviet submarine K-129

In March 1968 the Soviet ballistic-missile submarine K-129 sank with all 98 crew about 2,800 km north-west of Hawaii; the Soviet Navy could not find it, but US underwater listening systems did.

1968 CE · 40.10, -179.90 · status: official

The account

Soviet officers long suspected a collision with a US submarine, which the US denies. The CIA secretly located the wreck at about 4,900 m.

The researched reading

A Cold War naval loss with a known wreck. An onboard accident is the likeliest cause, with a collision with a US submarine the main disputed alternative.

Explanation	Weight	Why
A known natural phenomenon	40%	An onboard accident, such as a hydrogen explosion from charging batteries while snorkelling or flooding through the snorkel induction valve, is the explanation favoured by most naval analysts; diesel submarines of the time were prone to both.
Secret human technology	30%	Soviet officers believed a US submarine collided with K-129, which the US denies; a rogue-launch theory has also been argued. Both are secret-military explanations that the declassified record does not confirm.
Undetermined	22%	The share a generic explanation had beyond what has been shown for this case: it fits many cases like this one, but has not been demonstrated for this one.
Something known, misidentified	2%	Its place in “mysterious ocean zone” lists is a misreading; the wreck was located and partly raised.
A hoax or fabrication	2%	Some popular books add unsupported plots; the sinking itself is documented by US acoustic data.
Genuinely anomalous	2%	There is no gap that needs an exotic cause.
A poorly understood natural phenomenon	1%	Nothing points to an unknown cause.
Perception, memory or mind	1%	Not applicable.

Official position: The Soviet Navy never established the cause; the US has denied any collision. The CIA located and partly raised the wreck in 1974.

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