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@adroit
it might well be seized, (I assume you are undoing it, it is reverse threaded to the other side, i.e. it is a left hand thread)
A large adjustable spanner will work if it isn't seized, if it is seized it will be a bitch without the tools!
I don't think even the Park tool will do it if it is seized, that lug on the BB shell doesn't offer much purchase. A trip to you local bike shop might be on the cards.