half of the 1950s the only existing lane after the Tabac was the one mentioned; in fact, in those years, the lane that we now call "promenade" with the two "Piscine" chicanes was not yet defined, and only in the 1960s images we can notice the progress of the landfilling about that portion of the bay, including the Piscine area which will be completed shortly thereafter. In 1963 the starting line was again moved to Boulevard Albert 1er (opposite the promenade), without changes to the track from the "Tabac" to the "Gasometer" (incidentally, the swimming pool and the waterfront lane that 10 years later will become part of the circuit, had already been created). In 1972 the boxes were moved near the chicane area of the port, therefore was created a "new" chicane that was closer to the "Tabac" curve. After this chicane, the track continued on the usual straight (parallel to the starting lane) using the "Gasometer" curve for the last time. This solution lasted only a year and, in the following months, the main works were completed in time for the 1973 Grand Prix with the construction of a new section that still connects the "Tabac" curve to "Piscine" (Stade Nautique). This change will result in the addition of to the circuit – whose total length increased to – adding the new portion along the harbour, which followed the layout of the swimming pool and ended in a new chicane around the "La Rascasse" restaurant and then joined (with a slight climb to the Anthony Noghes curve) to the starting straight. The boxes were reinstalled in the old lane (now free). The layout took on its current appearance with the double chicane "Piscine", abandoning (by the 1973 GP) the old "Gasometer" curve (where the entrance to the new boxes was created). 1972 was also the last year for the passage under the old tunnel. In 1973, as anticipated, the track was modified at various points also due to the construction of new civil buildings. In particular, a new hotel was under construction in the "Old Station" hairpin area (Hotel Loews, later renamed Fairmont), resulting in an extension of the tunnel towards the "Portier" curve. The 1973 images show the unusual passage under the new long tunnel, above which the pillars of the Loews hotel are being built. At the exit of the tunnel there was the traditional port