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This article contains information that no longer applies to the current version of Star Trek Online. The mission has been removed as part of the Romulan Mystery revamp, released with the 5 Year Anniversary Event on January 29, 2015.

In Minefield the player is sent to deploy a new weapon to defend the Federation's transwarp network from Romulan incursion.


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Mission Text[]

Starfleet Command is concerned about the safety of our transwarp network. If the Romulans obtain access to it, they could reach almost every world in the Federation in minutes.

There is a scientist at Sierra Outpost II who has a possible solution.

He has developed a new type of mine that reacts to trace minerals that Starfleet uses in its starships that the Romulans and Klingons don't. If a ship has those minerals in its hull, there is no effect.

Without it, the mines detonate. Starfleet Command has concluded that this will adequately secure the transwarp network against the Romulan advance.

Proceed to Sierra Outpost II and meet with S'larin.

He will explain how to deploy the minefield. If it works on one conduit, will use the mines to protect the entire network.


Go to Sierra Outpost II in the Sierra Sector of the Alpha Centauri Sector Block and meet S'larin, a scientist who has developed a way to protect the Federation's transwarp network.


  • Attack Pattern Sierra
    • Go To Sierra Outpost II
    • Sierra Attack
      • Defeat Attacking Romulan Squadrons (0/3)
      • Beam to Station
  • Precious Cargo
    • Go To Sierra Outpost Station
    • Speak to S'larin
    • Secure the Station
      • Defuse Romulan Spatial Charges (0/3)
      • Tag Crates Containing Experimental Mines (0/3)
    • Return to Ship
  • To Serve and Protect
    • Go To Teneebia System
    • Destroy Large Rubindium Asteroids (0/5)
    • Deploy Mines Near Nav Beacons (0/3)
    • Keep the Transwarp Conduit Clear 3:00 [1]
    • Return to Sector Space
  • Report to Starfleet




NPC starships[]




  • Mine



Icon Name Description How to Get Points
Prototype Procurer icon.png Prototype Procurer Secure the Experimental Mines 10
Detour Required icon.png Detour Required Mine the Transwarp Conduit 10


For a walkthrough of this mission, visit the Walkthrough page.

Strategy Notes[]

  1. 3:00 means three minutes (countdown timer)
  • "Sierra Attack" Romulan squadrons are based around a space station on an asteroid in the lower left part of the map.
  • When you are destroying the Rubindium Asteroids you do not have to destroy the little asteroids.

Mission Replay[]

This mission is repeatable through Mission Replay, although the Rewards for completing might be reduced. Items scale to a player appropriate level (Scaling Rewards), as followed:

Level Rank SP Exp Mark <>
26–29 Commander 1552 1338 VI
30–39 Captain 1743 1878 VIII
40–49 Rear Admiral LH & UH 1935 1856 X
50 Vice Admiral 2126 1856 XI

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