Over the years his bird-welfare programme developed into a tourist attraction. Initially, he built viewing huts around the edges of the gully to give an overview of penguin activities, but the birds took them over as nest boxes. More recently, he has constructed a labyrinth of trenches and observation posts from which nesting pen­guins can be viewed at a distance of just four or five metres. The trenches are chest-deep with timbered walls and an inverted V of camouflage netting for the roof—and an abundance of viewing chinks. Where a major penguin thoroughfare crosses a trench, a wooden walkway two to four metres wide forms the roof.