Ridley Scott has boarded “Shadow Divers,” a Fox 2000 adaptation of the Robert Kurson bestseller. Scott will direct the film and produce under his Scott Free banner. The story follows two wreck divers who in 1991 discovered the hull of a German U-boat in waters off New Jersey. The divers spent seven years searching for the truth behind the ship and men who died inside it. The director, who last helmed “Kingdom of Heaven,” hasn’t committed to his next film. Gabler said “Shadow Divers” is logistically complicated and will require significant prep time.