Looking for things to do in North Sydney? Sub Base Platypus is an ideal setting for rest and recreation. Formerly a torpedo factory, submarine base and gasworks, Sub Base Platypus is a community recreation and work hub in North Sydney, homeland of the Cammeraygal People. Featuring a shaded BBQ area with seating, a pocket playground and a scenic waterfront promenade, Sub Base Platypus is a place where visitors can relax on the waterfront with friends and family....