Mining expedition 422 was an ill-fated Space Pirate Phazon-mining expedition prior to Metroid Prime 2: Echoes. In a computer terminal's scan, it is mentioned that this expedition left with three Pirates dead, two injured and one missing in action. It is not clear whether the expedition took place on either Aether or Dark Aether. The scan additionally mentions that a bioform was captured, likely an Ing or Darkling, but this is also not specified.
"Casualty Report, 07.203.04
Mining expedition 422 reports 3 dead, 2 injured, 1 missing in action. Captured bioform transferred to Science Team for study 07.203.01."