What is "deep-sixed"?
"Deep-sixed" means to destroy something to the point where it cannot be repaired; to eliminate or discard. Stark is telling Bruce that the data has been destroyed and cannot be fixed or retrieved. This phrase is informal and really isn't all that common. "Destroyed" is more commonly used in this kind of situation. Ex: We need to deep-six the evidence so the crime cannot be traced back to us. Ex: They deep-sixed the machine so that no one could utilize its power ever again. Ex: The criminals deep-sixed the murder weapon.