Swim-arrangement for amphibious tracked vehicle

An amphibious tracked vehicle, said tracked vehicle comprising one or more vehicle bodies and at least one track assembly pair per vehicle body, said track assembly pair being suspendedly connected to the vehicle body, the track assembly pair comprising two track assemblies for driving the vehicle, each track assembly comprising a drive means driven endless track arranged to run over a set of wheels of the track assembly, the vehicle body comprising under structure portions, each under structure portion running over an upper side of the track of each track assembly, each under structure portion being configured to be arranged at a distance from the upper side of the track during land operation of the vehicle so that a space is provided between each under structure portion and the upper side of the track of the corresponding track assembly, wherein during a swimming operation of the vehicle, an elongated member extending substantially along a length of the vehicle body is configured to be selectively expanded into the space provided between each under structure portion and the upper side of the track of the corresponding track assembly to variably occupy a portion of the space for reducing said space so as to, in connection to the swimming operation, reduce the flow of water between the under structure portion and the upper side of the track caused when the tracks are driven.