Waterway fans thought they might have stumbled across an important artefact from history when part of the Grand Union Canal was drained at Apsley for restoration works.
But excitement that an war air raid warden’s helmet had lain undiscovered below the water line for many years was short-lived.
Instead experts think that the helmet may have been a fancy dress prop. It is thought that the helmet was later fashioned into a planter that was fixed onto the side of a canal boat and possibly fell off, hence its watery resting place.
Canal and River Trust spokesman Chris Stanley said: “A helmet was found but I think its history might have got embellished a bit.
“It was certainly some sort of helmet but I’m not sure it had been in there for a long time.
“I don’t think it is a war helmet - as lovely as that would be.”
He said the find is now with staff from the trust.