Construction of a 48″ line (ND1200) between the gas hub of Oude Statenzijl in the Netherlands and the gas depot of Etzel (in Germany, Wilhelmshaven). Crossing under the Ems river with minimum distance between the bottom of the river and the tunnel of about 7 m; maximal depth of the river: 12 m, with an average tide of 8 meters. Length equal to 1.070 mm and external diameter of 2.500 mm.