The researches allow to install new buildings and produce stronger units. DefenceGround Weapons2in-ground gun 3in-ground gun 3.5in-ground gun4in-artillery gunNavy weapons Sonar 6in-navy gun 12in-navy gun Air forces Fighter Fleet air weapons BomberRadarRocket weapons Toxic weapon Atomic bombBuzz bombKamikaze
The researches allow to install new buildings and produce stronger units.
Defence
Ground Weapons
2in-ground gun
3in-ground gun
3.5in-ground gun
4in-artillery gun
Navy weapons 
Sonar 
6in-navy gun 
12in-navy
gun 
Air
forces 
Fighter
Fleet air weapons
Bomber
Radar
Rocket
weapons 
Toxic
weapon 
Atomic
bomb
Buzz bomb
Kamikaze
