The main project is composed of a number of sub-projects, each focusing on different aspects of the mission, but all linked in a way. There are:
- permanent projects, which work permanently on one of the general terms of the mission,
- R&D projects, which are often temporary projects aimed to develop new methods,
- tool projects, in which tools are implemented or maintained, and
- scenery projects, where scenery for specific areas is developed and distributed, often for demonstration purposes.