Italian shipbuilder Fincantieri has agreed to acquire majority stakes in four companies for an initial expenditure of about $687 million (€600 million), expanding its capabilities in marine drones, subsea services and underwater communications across commercial and defense markets.The agreements cover acquisitions of majority stakes in Next Geosolutions, WSense, Graal Tech, and Defcomm, which will be integrated into Fincantieri’s Underwater technological hub.Next Geosolutions…