A floating arrangement (200, 850, 860, 1000) comprising a controlling system for controlling a floating state of the floating arrangement (200, 850, 860, 1000), characterized in that the floating arrangement comprises at least two interconnected floating standard freight containers configured to form said floating arrangement, where - the floating arrangement comprises at least one controllable device (103, 103a, 103b, 104) for changing the floating state of at least one container of the floating arrangement and thereby the floating state of the floating arrangement by changing capacity of at least one intra-container water-displacing volume (101a-101f) comprised in at least one of the containers and/or by at least partially filling an inner volume of at least one of the containers with a water-displacing medium, and - the controlling system is configured to: o receive floating state information related to at least one container or the arrangement, o compare said received floating state information to desired floating state information and based on the comparison provide control information for at least one controllable device (103, 103a, 103b, 104) to change floating state of the at least one container and thereby the floating state of the floating arrangement towards said desired floating state, and o control the controllable device (103, 103a, 103b, 104) of the floating arrangement based on said provided control information to change the capacity of the at least one intra-container water-displacing volume and/or to fill an inner volume of the container with the water-displacing medium in order to achieve said desired floating state. - the floating arrangement comprises at least one controllable device (103, 103a, 103b, 104) for changing the floating state of at least one container of the floating arrangement and thereby the floating state of the floating arrangement by changing capacity of at least one intra-container water-displacing volume (101a-101f) comprised in at least one of the containers and/or by at least partially filling an inner volume of at least one of the containers with a water-displacing medium, and - the controlling system is configured to: o receive floating state information related to at least one container or the arrangement, o compare said received floating state information to desired floating state information and based on the comparison provide control information for at least one controllable device (103, 103a, 103b, 104) to change floating state of the at least one container and thereby the floating state of the floating arrangement towards said desired floating state, and o control the controllable device (103, 103a, 103b, 104) of the floating arrangement based on said provided control information to change the capacity of the at least one intra-container water-displacing volume and/or to fill an inner volume of the container with the water-displacing medium in order to achieve said desired floating state. o receive floating state information related to at least one container or the arrangement, o compare said received floating state information to desired floating state information and based on the comparison provide control information for at least one controllable device (103, 103a, 103b, 104) to change floating state of the at least one container and thereby the floating state of the floating arrangement towards said desired floating state, and o control the controllable device (103, 103a, 103b, 104) of the floating arrangement based on said provided control information to change the capacity of the at least one intra-container water-displacing volume and/or to fill an inner volume of the container with the water-displacing medium in order to achieve said desired floating state.