Angelo Renna Proposes Submerged Floating Tunnel for Strait of Messina

Architect and landscape designer Angelo Renna has proposed a submerged floating tunnel (SFT) as an alternative to the long-debated bridge across the Strait of Messina, connecting Sicily to mainland Italy. The six-kilometer tunnel, designed with Kittan Kodijat, would sit 50 meters below sea level to avoid ship traffic, with no seabed anchors. It would feature two levels: upper for cars, trucks, and high-speed trains; lower for bicycles with terrariums. Artificial islands spaced 500 meters apart would support floating pontoons and enhance local biodiversity. Renna aims to broaden the discussion beyond a simple yes/no on the bridge, emphasizing seismic risk, marine ecosystem, economic feasibility, and social impact. He cites historical precedents like Alain Grant's 1969 submerged bridge proposal and Norway's Bergsøysund Bridge (1992). On July 16, 2023, the EU approved €25 million for the executive design of the bridge's railway section, advancing a record 3,666-meter single-span suspension bridge with 399-meter towers. Renna argues his design has lower environmental impact and is fully removable, contrasting with the Channel Tunnel's seabed approach.