Starts in Benedict's smuggler area. Go inside and find Rammel. Enter the place he's guarding, go down and you should see some strange paneling. Looking closer you'll find there's a hidden entrance there, and inside there's a spy from the Bene Gesserit. You need to kill one of the workers, one with a certain device, then use that device on the lowest level at various machines in a specific order. There are 4 machines. You cannot sabotage them unless you've offered help to the spy already.
Once everything is shut down the quest ends and you get: 3 qp, 100,000 solaris and an improvement to your longblade skill.