Tips for Covert Missions?

I was curious if anyone had some tips for covert missions.

For example, I just attempted a covert disruption mission. Here's what I did:
  1. Flew to the settlement
  2. Landed
  3. Used my Maverick suit (G3, no mods)
  4. Found a habitat and scanned someone with L1 clearance
  5. Avoided guards
  6. Got into PWR building and scanned L3 tech
  7. Disabled alarms
  8. Disabled authorization scans
  9. Figured I'd clear the atmosphere and see if that would get rid of the techs inside
I did step 9 because I know it will take 2 minutes (or whatever) to power down the reactor. I figured people would come running in and turn it back on. So, I thought this would kill the couple of techs in the building. I didn't realize they had masks, and I guy just ran up to the panel. I shot him and killed him and then the other tech.

At this point, guards ran in and killed me... even though there were no alarms and nobody in the building.

What should I do differently?
 
Use a quieter weapon so no-one outside the building hears you.
Or use the zapper / energy transfer tool alternative mode. Works like a charm when doing assassination.
I've heard it doesn't generate notoriety when used on friendly but I haven't able to confirm that.
 
Turning off the alarms prevent reinforcements from dropping in, not every guard already in the area from converging on problems.

Disable the alarms then kill everyone, or use stealthier weapons inside.
 
To be more explicit, your weapon isn't silent, so guards within the noise radius (varies by weapon) came to investigate, then became hostile when they saw you in the restricted area / with a weapon drawn / near a dead body. It sounds like you're talking about one of the layouts with a detached PWR building with the alarms panel there. There's usually two L3 techs inside - it's very hard to sneak in to the alarm panel and avoid being seen by either, so you usually need to kill them. If you do, either run away very fast, or crouch and hide behind the reactor core; either way if you can avoid being seen for a minute or so the guards will give up and de-aggro.

There's a great series of tutorial videos on stealth mechanics here:
 
Also, keep in mind that when you shut down the plant, alarms or not, the settlement guards will converge to the power plant in an alert state anyway, and will become instantly hostile when they see you.
 
What I do is sneak my way to the Command or Power building, deactivate alarms and security scanners, and sneak back out without killing anyone, then go and do my objective since triggering an alert won't activate the alarms and fail the mission. If I have to kill everyone in the settlement, I'll hunt everyone down one-by- one like a serial killer, then shut down the reactor once everyone's gone.

If I have to turn out the power covertly, I'd either serial murder everyone beforehand, or hunker down and ambush each guard as they enter the reactor area and take the regulator and run.

Long story short, stay on the move, your jetpack is your friend, and don't try to fight more than one guard at once if you can help it.
 
Yeah, I was thinking of the missions which specifically state you can't use lethal force.
Those particular missions refer to everyone but the target. You can still take out your target if its an assassination. Just don't kill anyone else if they go hostile. Just leave asap.
 
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