Editing Biotics Lab (section)

== Defensive positions ==
* At the spawn, the vast majority of [[Specimens|specimens]] will funnel through the middle corridor when the doors to the immediate left and right are welded.
** If any [[Specimens|specimens]] that have less health than a [[Scrake]] attack the right door, then a grenade launcher can be used to easily kill them by firing through the portholes onto a nearby wall.
** Due to the amount of [[Specimens|specimens]] that traverse the choke point, this is ideal for [[Support specialist|support specialists]]. One [[Demolition|demo]] is advised to eliminate [[Specimens|specimens]] on the right door, and [[Fleshpound|Fleshpounds]].
** Do not weld any doors in the middle corridor, as it may divert the [[Specimens|specimens]] towards the other welded doors.
** Have at least one player positioned at the intersection so that [[Specimens|specimens]] cannot spawn from behind.
*A major defensive position on the level can be found on the middle floor, inside the two large adjacent rooms. It is most effective when the door closest to the [[Trader|trader]] is welded shut, and it is ill-advised to stay near it because more [[Specimens|specimens]] would be attracted to the door. The tactic taken from this point onwards depends on the number of people in the party:
**If there are only small numbers in the party, then it is advised to stand just outside the open door in the cross section of the corridors and use the room itself as a fall-back point.
**If the party is nearly full (4-6 players), then it may be too crowded to effectively employ the above tactic. In this situation, players can split up into two additional groups: one in the intersection with the three stairwells, and one down the other corridor in the room just at the top of the stairs. For the group stationed by the open door, only one good [[Sharpshooter|sharpshooter]] or [[Demolition|demo]] player is needed to make sure that the other two groups are not attacked from behind and to cover their retreat when necessary.
***The latter strategy, while it can be more effective than the former, requires more teamwork and communication.
***In the most north-eastern room in this section (refer to the map of the middle floor, below), there is an open duct where [[Stalker|stalkers]] and [[Crawler|crawlers]] spawn. It is marked by a flashing light.
*The corridor directly left of the spawn point, providing the door at one end is welded, can be used as a quick defensive set up for the first wave.
*In the first room on the left down the corridor, where several beds are found, players can barricade themselves by welding shut both of the doors.  Incoming [[Specimens|specimens]] can be shot from the inaccessible window. A second person, ideally a [[Support specialist|support specialist]], can watch the door at the opposite side of the room. On solo, a [[pipe bomb]] or two can help defend instead.
*On the lowest floor, next to the [[Trader|trader]], there is a small room with one door that can be welded. Caution must be given to the hole in the ceiling from which [[Crawler|Crawlers]] and [[Stalker|Stalkers]] can enter. There is nowhere to fall back to when overwhelmed, and once the glass window or door is destroyed, the [[Specimens|specimens]] can swarm in.
**At the [[Patriarch]] wave, if team had to hole up at the below [[Trader|trader]]; stairway door shouldn't be welded but keep shut. Some pipes laid front and back of the door and stairs, would be enough for the first act.
*On the middle floor, below the two sets of stairs is a large hallway intersection with a weldable door on the right that leads to stairs down to the bottom floor where the [[Trader|trader]] is located.
**If said door is welded, a [[Support Specialist|support specialist]] can guard the door as well as the two sets of stairs from [[Crawler|Crawlers]] that spawn in the ceiling in the room above.
**The hallway behind is very long, making it ideal for a [[Demolitions|demo]] to shoot grenades at incoming [[Fleshpounds]] from either direction as well as for a [[Sharpshooter|sharpshooter]], who can assist the [[Support specialist|support]] in guarding the stairs.
**A [[Commando|commando]] can set up at the other end of this long hallway and fire on [[Specimens|specimens]] coming from the red-lit room.
**As teammates will be separated substantially in this defense point, communication is critical to signal when a heavier [[Specimens|specimen]] is incoming so that firepower can be focused on it.