The shelters date back to the early 1970's when test rockets were fired from the Woomera Rocket Range in South Australia to the north. Some of these rockets included components of the British Blue Streak ballistic missile. Rockets that malfunctioned were exploded over this desert region of the Northern Territory. Many rocket parts including gas bottles, fuselage sections, rocket motors and even nose cones can be found scattered in the desert today (if you visit Jervois Station you can see a collection of parts). Shelters were built on all the cattle stations in the area and a radio communication system was established to warn station people of a rocket firing. The station people were supposed to occupy the shelters during a firing but they rarely did - instead having a party to watch the rockets fly over!
Beautiful shot! L&F greetings Evan