The 2.4-km road tunnel under the Paraná River, linking Paraná with Santa Fe on the opposite bank. It is the only direct route between the two provincial capitals, and an unusual engineering feat for the era — a series of pre-fabricated concrete tubes sunk to the river bed and joined together. There is a small museum about the tunnel's construction at the eastern entrance, useful only as a curiosity. The drive through — twenty minutes either way with traffic — is the experience.
Subfluvial Tunnel
A story
When it opened in 1969 the Hernandarias tunnel — now renamed for its two engineers, Raúl Uranga and Carlos Sylvestre Begnis — was one of the longest underwater road tunnels in the world. It is still the only fixed link between Entre Ríos and Santa Fe provinces, and the only way to drive between the two cities without a long detour to the north or south. The tunnel was sunk in pre-cast concrete sections lowered to the river bed, then connected together.