Icon: Snowflake
Type: Defensive
Action: After sub-to-sub combat, the attacked sub remains stationary for an hour, unless the opponent also has an Immobilizer onboard.
Text: You can't win the war by standing around.
Differs from a saboteur in that the attack force, instead of being diverted and potentially coming back stronger, is directly delayed to allow defensive preparations to complete.
C'mon, it's a nifty concept.