Fiber-optic cable useful in a borehole is provided, with at least one optical waveguide (2), at least one metallic tube (1) which at least partially surrounds the at least one optical waveguide (2), and at least one additional layer, which at least partially surrounds the at least one metallic tube (1). The fiber-optic cable includes a separator which contributes to or cause mechanical decoupling of individual components of the fiber-optic cable.