Science fiction/Upgrade/Sonar


Detecs hidden units in water (except overheat)


Upgrade
Producable in: Harpoon diver, War diver, Resonator, Radio operator, Radar, Dock
Costs: 100 Crystal ore, 50 Energy
Duration: 10 turns
Stage of development: Specialism and tactics

Elements of the universe: Water
Countries of the earth: Japan, Great Britain, France, USA, Cuba, Russia, Italy, Iran, Germany


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