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O what is this?

ROBIN BIRD

Well-Known Member
RAF Helensburgh tested a secret O Mine during WW2. A contemporary report by a tester said 'I have no idea what O stands for. All we had to do was drop this magnetic mine.' Any idea what O stood for?
 
There's no such thing as a osculating mine as far as I know. But as I google RAF Helensburgh it seems to have been a Navy test establishment, for the rest I cannot find anything on the internet about any type of O mine, either the combination of Helensburg with an O mine.
 
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