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Recently I tried to find a right word which would describe a fact that something was not detected. The adjective 'undetected' does exist, but how about a pertinent noun? Would 'undetection' as an antonym of 'detection' be of help or one ought to find another word instead?

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lukandhow about a pertinent noun?
Would 'undetection' as an antonym of 'detection' be of help

Not 'undetection'. The usual solution to this problem is "failure to ____", or in your case, "failure to detect".

CJ

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lukandWould 'undetection' as an antonym of 'detection' be of help or one ought to find another word instead?

I imagined talking about a submarine whose presence is a threat, saying that its detection is vital, and its _____ would be disastrous. I would use "non-detection". "Un-" seems to me to imply agency too much for that. Undetecting would be to undo detecting.

 CalifJim's reply was promoted to an answer.