At some point in the late 23rd century, the Salvoxia suffered a cascade failure. System after system failed, and eventually, the life support generators began to fail one by one. There wasn't enough air to sustain the whole crew, so they began to draw lots, hopefully awaiting rescue. Salvoxia drifted in space for eighty years until it was discovered.
Neelix told Tuvok this story when Voyager's systems began systematically failing, as a result of an electromagnetic life-form the ship had accidentally taken on from a nebula. Icheb wondered if the vacuum of space had preserved the bodies, and Mezoti wondered if the crew of the Salvoxia were forced to eat each other to survive after emergency rations were gone, before being promptly cut off by Neelix. (VOY: "The Haunting of Deck Twelve")