Abstract: In a deployable mast composed of: a plurality of resiliently flexible longeron elements; a plurality of resiliently flexible lateral elements arranged in groups of lateral elements constituting batten frames spaced apart along the longeron elements and delimiting respective bays of the mast, with each group of lateral elements being connected to all of the longerons; and a plurality of flexible diagonal elements each connected between two longeron elements and extending between two groups of lateral elements, the longeron, lateral and diagonal elements being constructed and connected to constitute a structure movable between a deployed state defining a column of predetermined length and a stowed state defining a structure having a length less than the predetermined length, there are provided five such longeron elements and each group of lateral elements is connected to all of the longeron elements.