Robert Redford is way out in the Indian Ocean, when his sailboat is hit by a shipping container. That’s only the beginning of his solo ordeal for survival. The gradual deterioration of his situation is detailed methodically, without dramatics, dialogue and with minimumal emotion (the opposite of Bullock’s solo challenges in “Gravity.). Still, the continued quiet persistence in the face of continued frustration is effective. It’s not especially gripping, but involves in an objective, almost procedural way.