The Celtris III holoprogram was a training holoprogram used by Starfleet officers Jean-Luc Picard, Beverly Crusher, and Worf to prepare for a commando raid on a suspected Cardassian lab on the planet of Celtris III. This preparation included running against the clock in anticipation of strict time limits on the operation, as well as rock climbing and rappelling, and breaking into a lab. (TNG: "Chain of Command, Part I")