A nearby site on High Down was employed in the testing of rockets for the British ICBM programme. The headland at High Down was used for Black Knight and Black Arrow rocket engine tests from 1956–71. During the peak of activity in the early 1960s some 240 people worked at the complex, while the rockets were built in nearby East Cowes. These rockets were later used to launch the Prospero X-3 satellite. The site is now owned by the National Trust, and is open to the public. Concrete installations remain, but the buildings that were less durable have either been demolished or were torn down by the elements.