The central conceit of Digger hinges on an audacious, genre-bending structural twist: the bombastic saga of Digger Rockwell's Arctic catastrophe is revealed to be Fossil Fools, a live stage play being rehearsed twenty-five years later in a ruined, dystopian future. Tom Cruise does not play the historical Digger Rockwell, but Curtis Markson, an aging, frustrated actor who resents being forced to play the tycoon as an absurd caricature rather than a nuanced human being.
As Markson rehearses backstage, he desperately tries to contact his missing daughter, whose commercial flight has vanished in a catastrophic Category 6 storm. In the climax, Markson's Rockwell character dramatically leaps to his death from an offshore oil rig set, receiving rapturous applause from the theater audience. Immediately following the curtain call, Level Four air quality sirens ring out, forcing the theater patrons to put on gas masks and disperse into a submerged, toxic, and militarized urban wasteland.