A cassette of a floating bridge, the cassette comprising a fixed portion (21) for accommodating an inflatable pontoon and a movable portion (22) being movable upon expansion of the inflatable pontoon, wherein the cassette comprises a locking arrangement for coupling the cassette with other cassettes of the same type by coupling edges (31, 32) to form a floating bridge with side edges (33), wherein the locking arrangement comprises a set of elements mounted at the fixed portion (21) of the cassette and comprising a plurality of main locks positioned at the coupling edges (31, 32) of the cassette, each comprising a socket (4, 5) positioned at one coupling edge (31) for receiving a flat bolt (1, 2) having a tapered end and configured to be slidably extensible from the opposite coupling edge (32) of another cassette of the same type, a pair of side locks positioned at the side edges (33) of the cassette, each comprising a first side socket (10) near one of the coupling edges (31) and configured to receive a head (9) of a pivotable arm (3) being mounted near the opposite coupling edge (32) of another cassette of the same type.