an access tunnel 1 having a total of four tunnel elements 10 results from fig1 . each tunnel element 10 has a framework 12 having four rollers 11 , wherein the framework 12 has a smaller frame 14 of archway shape at one end and a frame 16 of archway shape which is larger in comparison therewith at the opposite end . the term “ smaller frame of archway shape ” is to be understood in this respect in relation to the term “ larger frame of archway shape ”; that is , the smaller frame of archway shape has a smaller circumference than the frame 16 of archway shape larger in relation thereto such that a conical extent of the individual tunnel elements 10 results in the longitudinal direction , as is shown in fig1 . the cornering of an access tunnel 1 having a plurality of tunnel elements 10 is shown in fig1 a . the framework marked by 12 has a cover 18 , for example composed of a transparent plastic , over its circumference . the individual tunnel elements 10 are connected to one another by cords 5 to limit the extension of the tunnel elements among one another . such a cord is located at each side of the tunnel elements . the fastening of the cords 5 takes place between the vertical limbs 14 a and 16 a of the frames 14 and 16 of archway shape ( see also fig3 ). the two limbs 14 a , 16 a of each frame 14 , 16 of archway shape are connected to one another by a respective arcuate web 14 b , 16 b in the roof region . the frame 16 of archway shape which is larger in relation to the smaller frame 14 of archway shape has a seal 20 likewise of archway shape for bridging the spacing between two tunnel elements 10 in the pulled - apart state of these tunnel elements ( see fig3 ). the seal 20 of archway shape is marked by 22 in the region of the limbs 16 a of the larger frame 16 of archway shape and contacts the cover of the respective adjacent tunnel element 10 ( fig4 ). the seal 20 of archway shape comprises a reinforcement carrier , for example a fabric , which is coated by an elastomer at at least one side . this cloth is easily deformable and , as already stated , lies at the cover of the adjacent tunnel element 10 . the seal 20 of archway shape in the roof region ( arrow 23 ) is elastic per se , that is , is formed in the manner of an elastic band , whereby it is achieved that the seal 20 of archway shape lies under strain on the cover 18 of the adjacent tunnel element in the roof region . this is against the background that in particular no water should be able to enter into the transition region of two tunnel elements in the roof region . if now fig3 is again looked at , the wings 24 can be recognized at the vertical limbs 14 a of the frame 14 of archway shape which is smaller in relation to the frame 16 of archway shape , the wings being formed as a guide device and being arranged at the limbs 14 a pivotable about a vertical axis . the joints of the wings for the connection to the limbs 14 a are designed in this respect such that the wings 24 come to rest in any predefined position . these wings 24 serve as a guide device or passengers passing through the access tunnel to avoid any collision of the passengers with the frame 14 of archway shape .