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Apollo 13's emergency was caused by the spacecraft's service module, not Saturn V:

https://en.wikipedia.org/wiki/Apollo_13#Investigation_and_re...

Apollo 13 (and previous flights) did experience "pogo oscillation" from the Saturn vehicle which caused one of the first stage engines to shut down early.

https://en.m.wikipedia.org/wiki/Pogo_oscillation

The damage to the Apollo 13 service module that caused oxygen tank 2 to rupture almost certainly happened well before launch during ground testing.

See https://nssdc.gsfc.nasa.gov/planetary/lunar/ap13acc.html

So? It was irrelevant to the issue. The issue was traced back to manufacturing.

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