"S-Missions" is a term used for when the members of Widmore's team undertake a mission. The term refers to the secretive or duplicitous nature of these missions in contrast to the A-Missions, B-Missions, or O-Missions in which consensus on what needed to be done was usually well-voiced amongst those members. An "S-Mission" refers to a mission comprising crew members on Widmore's submarine, which usually includes a combination of Widmore, Zoe, and/or Seamus.