So at first i completed this nonsense. But this was really hard. Mostly because of dredge skill set. Dredges that guard this machine just constatly spam with their Tremor skill. And since there is around 10 dredges at the end of the bridge, and no cover from Tremors, they just spam it, knockback you and kill in 5 seconds. If you manage to get close to them, 10 dredges in melee still serious threat, since there is PS boss also.
So all mission just become suicidal zerg rush, when you run, kill 3-4 enemie, die and repeat.