Torres Zeta-1 was a holoprogram created by Lieutenant B'Elanna Torres, depicting the massacre of the Maquis.
In 2375, after it had been discovered that Torres had been running several holodeck programs without the safety protocols on, Commander Chakotay activated this program in an attempt to get to the bottom of her reckless behavior. Forced to watch her friends Li-Paz, Meyer, Nelson, and Sahreen being slaughtered, Torres finally opened up to him. (VOY: "Extreme Risk")