You wake up from a coma unable to move or speak. Blinking your left eyelid for each letter, you wind up “dictating” an international best-seller. The composer Joby Talbot, the librettist Gene Scheer, the director Leonard Foglia, and the Dallas Opera sensed operatic potential here, and given their track record, we’ll willingly suspend disbelief. These are key players in the team that transformed Jon Krakauer’s gripping nonfiction yarn of death on the world’s rooftop, Into Thin Air, into the hypnotic chamber opera Everest, an immersive production that was styled like a graphic novel. Lucas Meachem, who is fresh off Don Giovanni with the LA Opera, plays the man who blinks, anchoring a superb cast. Emmanuel Villaume conducts. —Matthew Gurewitsch