Between the '...''s is what you can add. Spoiler'd for [i]safety[/i] purposes. [spoiler]...Line every corridor with sharp objects that are attached to unstable electrical currents, make the entire structure a killzone, ensure escape exits are accessible to all humans that aren't the attackers... ...Convert everyone into Space Marines in some shape, way, or form... ...Equip them with makeshift spears, among other makeshift tools (including dangerous acids that would be fired from a bottle)... ...And grab almost-everyone else's ideas...[/spoiler]