The Brunel Museum is a small museum situated at the Brunel Engine House, Rotherhithe, London Borough of Southwark. The Engine House was designed by Sir Marc Isambard Brunel as part of the infrastructure of the Thames Tunnel which opened in 1843 and was the first underwater tunnel to have been built anywhere in the world. It comprises the Engine House and the Tunnel Shaft, with rooftop garden. Isambard Kingdom Brunel worked with his father on the project from 1823 and was appointed Resident Engineer in January 1827 at the age of 20.