A tactical transport cart configured to be navigable over both ground surfaces of topographic terrains and water-covered surfaces of hydrographic terrains, the transport cart comprising: a frame having an open structure formed by a pair of laterally spaced-apart longitudinally-extending frame members, between which a triangular cart body is centrally affixed and extends downwardly therefrom defining a lower enclosure within the cart body, and a platform affixed to the frame members adjacent the upper side of the cart body defining a payload support on the frame, a pair of terrain-engaging transport propulsion members attached to the frame in laterally spaced relation for supporting the frame at an elevation above surrounding terrain, a handle structure attached to the frame and extending therefrom in orthogonal relation to the transport propulsion members, at least one motor connected in driving relation to the transport propulsion members, a battery for providing motive power to the motor, a control device operatively connected between the battery and the motor for controlling supply of motive power to the motor, the handle structure being configured for steering movement of the frame over surrounding terrain while enabling simultaneous selective access to and operation of the control device, the frame, transport propulsion members and handle structure being cooperatively dimensioned and configured for movement of the cart over ground surfaces of topographic terrains and for partially and fully submerged movement over water-covered surfaces of hydrographic terrains, the motor, the battery, the control device and connections therebetween being sealed against water intrusion during submerged operation. a frame having an open structure formed by a pair of laterally spaced-apart longitudinally-extending frame members, between which a triangular cart body is centrally affixed and extends downwardly therefrom defining a lower enclosure within the cart body, and a platform affixed to the frame members adjacent the upper side of the cart body defining a payload support on the frame, a pair of terrain-engaging transport propulsion members attached to the frame in laterally spaced relation for supporting the frame at an elevation above surrounding terrain, a handle structure attached to the frame and extending therefrom in orthogonal relation to the transport propulsion members, at least one motor connected in driving relation to the transport propulsion members, a battery for providing motive power to the motor, a control device operatively connected between the battery and the motor for controlling supply of motive power to the motor, the handle structure being configured for steering movement of the frame over surrounding terrain while enabling simultaneous selective access to and operation of the control device, the frame, transport propulsion members and handle structure being cooperatively dimensioned and configured for movement of the cart over ground surfaces of topographic terrains and for partially and fully submerged movement over water-covered surfaces of hydrographic terrains, the motor, the battery, the control device and connections therebetween being sealed against water intrusion during submerged operation.