A robust fiber optic cable, which is well suited for harsh environments, such as undersea environments when attached as a tether to a mobile undersea vehicle includes an optical fiber loosely surrounded by an inner containment tube. A suspension fluid is disposed between the inner containment tube and the optical fiber. A plurality of strength members surrounds the inner containment tube, and an outer jacket surrounds said plurality of strength members. In preferred embodiments, the outer jacket is bonded to the strength members and/or the inner containment tube.

 
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