(1): Main tunnel. 11-11.4 metres wide. Horseshoe shape shown, but a circular cross section was used in areas with difficult geology.
(2): Service tunnel. 4-5 metres wide. Sprayed concrete thickness 0.12-0.15 m. Horizontally, the service tunnel is located 30 m away from the main tunnel (centrelines)
(3): Pilot tunnel. 3.6-5 metres wide. Sprayed concrete thickness 0.12-0.15 m. The depth of the pilot tunnel varies between 0 and 118 metres below the floor of the service tunnel. In the middle of the Tsugaru Strait the pilot tunnel was not constructed. Horizontally, the pilot tunnel is located 15 m from both the service and main tunnels (centrelines) - in between.
(4): Connecting galley. Located at intervals of approximately 600m.
References
↑Morse, D. (May 1988). "Japan Tunnels Under the Ocean". Civil Engineering58 (5): 50-53.
↑Paulson, B. (1981). "Seikan Undersea Tunnel". American Society of Civil Engineers, Journal of the Construction Division107 (3): 509-525.
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