“Pensacola here has a 3 mile bridge and there’s a 7 mile bridge in the Keys...........”
The water under the 7 mile bridge is shallow enough to see the bottom. The Strait of Sicily is over 1000 feet deep at parts.
Plus the current rips through the strait.
As you pointed out it is also very deep. Which is why a tunnel will not work.
Plus the two Earth crust plates are moving/separating.
Throw in the Calabria and Sicilian Mafia and I will say Areva Derchi.