Floating tunnels; Submerged bridge-like tunnels, i.e. tunnels supported by piers or the like above the water-bed (pontoons or floating bridges E01D15/14)

Underground or underwater structures; Retaining walls > Tunnels submerged into, or built in, open water > Floating tunnels; Submerged bridge-like tunnels, i.e. tunnels supported by piers or the like above the water-bed

underground or underwater structures (underground tanks B65D88/76; hydraulic engineering, e.g. sealings or joints, E02B; underground garages E04H6/00; underground air-raid shelters E04H9/12; burial vaults E04H13/00); Retaining walls > Tunnels submerged into, or built in, open water (construction or placing of caissons in general E02D23/00; joining caissons to each other under water, in general E02D25/00) > Floating tunnels; Submerged bridge-like tunnels, i.e. tunnels supported by piers or the like above the water-bed (pontoons or floating bridges E01D15/14)