The 30 meter long, 285 dwt tug Wulf 7 became disabled in the North Sea near Borkum Island.   The tug had suffered engine failure after departing Cuxhaven.   Another tug, the Anglian Earl, came to the Wulf 7 assistance.  The Anglian Earl took the Wulf 7 under tow and proceeded to Eemshaven.   No reports of injuries, damage or pollution being released.