Dug at the bottom of the channel of the Bay a trench about 80 feet deep to place the tubes or tunnel boxes and to protect them were covered with a layer of five feet of Rocky material. An iron curtain, which closes its entry, hermetic mode resguardaria to the path of floods which could result in a hurricane. Carefully studied the oxygenation and lighting systems, as well as the lining of the interior walls that gave a special tile that would break the echo that will cause the noise of vehicles running. Impermeability was treated with great care. Up to September 1957 served in the play 60 000 cubic metres of concrete of high factor. Many years later the engineer Menendez would remember that the construction of the tunnel gave employment to more than a thousand Cuban workers who in their vast majority already had experience to have participated in the construction of the tunnel that links below the Almendares River, the street line and the 31 Avenue in the Marianao of then. The work, scheduled to be executed in 30 months, actually delayed 32 because of the rain that crippled by long days work. But not only was the access fast to the beaches of the East what did arouse the necessary wills that he agreed to the construction of the tunnel. If the tunnel which was then projected between the Brazilian cities of Niteroi and Rio de Janeiro across Guanabara Bay, was due to growing between both cities transit, stated in 1956 in the journal architecture, Havana, the of here would be to urge to habaneros to to make their homes and live there side because its main purpose is to facilitate the development of the city to the East. Really the main interest that catalyzed the construction project had to do with a claim to extend far beyond the city limits where were situated in those moments.The Ciudad del Este, the city of the future, with those names began to be renamed what was planned.