Some of the missions that I dislike the most are the ones that have you standing around waiting for multiple ambushes.  I think that's the only criticism I had of the arc overall.
 
	 
 
	Brought all three assets back with me via Mark & Recall, went up the hall and fought all the ambushes.   Found out going back to the lab seemed to spawn the ambushes earlier, but I'm not sure.   Turrets only defeated a Stealth Tank that had stood up and followed me back.  Dreck was beaten by at the entrance to the next room.   So, as mentioned, the PCs need to beat Dreck and not let any of the lab defenses kill him.   Probably a percentage of damage, but those turrets spam a lot of damage. 😉
 
	 
 
	Bonus mission, took me a bit to find the people to talk to and after I talked with Pierce, the portal wasn't obvious because the view to it was blocked.  I'd suggest moving it out a bit more instead of all the way in the back of the container.