Dickens based Joe Gargery's house on the forge in the village of Chalk, near Gravesend, Kent – a replica was erected on St Mary's Marshes on the Thames Estuary. Pip and Herbert Pocket arrange to meet Magwitch and help him escape at Chatham Docks where slip 8 was used for the scene as well as exterior shots of the prison hulk ships. The River Medway and the adjacent St Mary's Marshes appear in scenes where Pip and his friend, Herbert Pocket, row their boat to a small inn whilst waiting for the paddle steamer to arrive. The ship used in the film was called "Empress", dating from the latter half of the nineteenth century and owned by Cosens & Co Ltd of Weymouth. She was brought down to the River Medway for the shoot. "New masts were stepped-in with square rigging and dummy sails, the funnel was lengthened and the paddle-boxes enlarged until it looked exactly right."