A wing-in-ground effect vehicle comprising: a main wing comprising one or more main wing control surfaces (118, 120); a tail comprising one or more tail control surfaces; and a retractable hydrofoil system (108, 110) comprising a retractable hydrofoil, wherein the retractable hydrofoil system is configured to operate in: (i) an extended configuration in which the retractable hydrofoil extends below a hull of the wing-in-ground effect vehicle for submersion below a water surface and (ii) a retracted configuration in which the retractable hydrofoil is retracted at least partially into the hull of the wing-in-ground effect vehicle; characterised by further comprising: a blown-wing propulsion system comprising an array of electric motors arranged along at least one of the main wing or the tail; and a control system configured to (i) determine a position, orientation, and velocity of the wing-in-ground effect vehicle and (ii) maneuver the wing-in-ground effect vehicle based on the determined position, orientation, and velocity, wherein maneuvering the wing-in-ground effect vehicle comprises (i) causing one or more actuators of the retractable hydrofoil system to change an orientation of the retractable hydrofoil when the retractable hydrofoil system is operating in the extended configuration, (ii) causing one or more actuators of the main wing and the tail to change an orientation of the main wing control surfaces (118, 120) and tail control surfaces when the retractable hydrofoil system is operating in the retracted configuration and (iii) causing one or more of the electric motors of the blown-wing propulsion system to change speed. a main wing comprising one or more main wing control surfaces (118, 120); a tail comprising one or more tail control surfaces; and a retractable hydrofoil system (108, 110) comprising a retractable hydrofoil, wherein the retractable hydrofoil system is configured to operate in: (i) an extended configuration in which the retractable hydrofoil extends below a hull of the wing-in-ground effect vehicle for submersion below a water surface and (ii) a retracted configuration in which the retractable hydrofoil is retracted at least partially into the hull of the wing-in-ground effect vehicle; characterised by further comprising: a blown-wing propulsion system comprising an array of electric motors arranged along at least one of the main wing or the tail; and a control system configured to (i) determine a position, orientation, and velocity of the wing-in-ground effect vehicle and (ii) maneuver the wing-in-ground effect vehicle based on the determined position, orientation, and velocity, wherein maneuvering the wing-in-ground effect vehicle comprises (i) causing one or more actuators of the retractable hydrofoil system to change an orientation of the retractable hydrofoil when the retractable hydrofoil system is operating in the extended configuration, (ii) causing one or more actuators of the main wing and the tail to change an orientation of the main wing control surfaces (118, 120) and tail control surfaces when the retractable hydrofoil system is operating in the retracted configuration and (iii) causing one or more of the electric motors of the blown-wing propulsion system to change speed. a blown-wing propulsion system comprising an array of electric motors arranged along at least one of the main wing or the tail; and a control system configured to (i) determine a position, orientation, and velocity of the wing-in-ground effect vehicle and (ii) maneuver the wing-in-ground effect vehicle based on the determined position, orientation, and velocity, wherein maneuvering the wing-in-ground effect vehicle comprises (i) causing one or more actuators of the retractable hydrofoil system to change an orientation of the retractable hydrofoil when the retractable hydrofoil system is operating in the extended configuration, (ii) causing one or more actuators of the main wing and the tail to change an orientation of the main wing control surfaces (118, 120) and tail control surfaces when the retractable hydrofoil system is operating in the retracted configuration and (iii) causing one or more of the electric motors of the blown-wing propulsion system to change speed.