The Border Patrol see them as targets in an endless game of cat and mouse. The Californians see them as an endless supply of cheap labour. But Louis Hock saw them for what they are - poor Mexicans seduced by the rich society across the border. He spent three years living among a group of Mexican 'illegals' in San Diego - recording their lives, their hopes and their repeated deportations: 'I have become a witness to an odyssey, an odyssey of millions.'