Deep-laid

Captain Cuttle, in the exercise of that surprising talent for deep-laid and unfathomable scheming, with which (as is not unusual in men of transparent simplicity) he sincerely believed himself to be endowed by nature, […]

'Then why did you make every preparation—turn the Republics into armed camps—prepare deep-laid plans for the invasion of our Colonies?'

What worried him was the wire-cutting; he could not but believe that it was an important part of the deep-laid labour conspiracy.