Apply this mod
http://www.filefront.com/15776267/RE...ion_Tweaks.7z/
Which changes the AI By
Ducimus
Or this Mod
http://www.filefront.com/15786093/Ge...20MOD%201.0.7z
Which I made, Mine is a little Harder. Forget about Harbor Attacks, because you need to be at least 60 meters deep and have silent running to be able to escape