The contract covers the development of part of the T5-T6 planted walkway, specifically the first phase of these developments consisting of the implementation of embankments and networks on the T5-T6 rail slab.

In addition to the brief description of II.1.4), these are:

- the implementation of networks (drinking water, sanitation) in a visitable gallery,

- the creation of concrete connections including networks (sanitation, drinking water),

- the establishment of embankments above ground.