Aliens can do it with only 20 bp.
1 trapper and 1 hive.
tried that, didn't work
what I did, was that in a map, there are two corners. And in each corners, there's reactor with tenelodes and om with eggs. Each of them has turrets and tubes, trappers, and hives in each opposing sides.
What I learned: Those swarms in the hive is very persistant, they chase you for a long time... In Arachnid, near the alien base with the hallway near, I ran to the tunnel, and when i looked back, the swarms were still chasing me and i died =/