We stayed at the Hilton Double Tree in Alice Springs - See our hotel room in the link below:
We visited and videod Alice Springs Desert Park on 26 January 2016 in the links below:
It is sited on 1,300 hectares (3,212 acres), with a core area of 52 hectares (128 acres). It is an institutional member of the Zoo and Aquarium Association (ZAA) and Botanic Gardens Conservation International (BGCI).
The park contains native animals and plants representative of central Australian desert environments, and contributes to their conservation through research programs as well as through public education. It offers people the opportunity to experience the variety of the deserts of central Australia, exploring the inter-relationships between the plants, animals and people.
The area is culturally important to the local Arrernte people. Much of the work of the park is under the auspices of their apmereke-artweye (decision-makers) and kwertengerle (caretakers) - people once known as the park's traditional owners.
I met a couple of gentlemen (associated with the Military) in Alice Springs who were there on assignment which I suspect related to the secretive communications facilities there. We met in the Clothes Washing area. Could they possibly be the colleagues you were talking about?