The Szent Gellért tér station and the Fővám tér stations are twin stations; both are on the bank of the Danube. They are composed of a cut-and-cover box and tunnels. The box is supported by levels of reinforced concrete beams; the resulting structure is similar to a net, like a bone or skeletal system. The architectural and structural concept based on random beam grid and the underground bone texture combined with the organically implemented construction system were compatible without compromises with the often volatile and changing conditions of the planning and building processes