Take ice cream out of freezer to soften approximately ½ hour.
In a bowl combine 3 1/2 cups cookie crumbs and butter. Press into a 9 X 13 greased baking dish.
In a bowl mix, softened ice cream and 1 container (or 8 ounces) of cool whip until combined. Spread ice cream mixture over cookie crust. Cover and freeze for 30 minutes until set.
Drizzle fudge topping over ice cream mixture. Cover and freeze until set.
Spread remaining whipped topping over fudge mixture and sprinkle remaining cookie crumbs on top. Cover and freeze for 2 hours or until completely set.