[44net] 5 GHz link over 250 km of sea between Corsica and France / Italy ?

Hi all, Some friends from south of France submitted the idea of a 5 GHz link between France and Corsica. The distance is 200-250 km, mostly over the sea. It's far longer than what I could see on HamNetDB, for example. But it's shorter than WiFi world records (some of them attempted more than 10 years ago between Italy and Sardinia). I never attempted links longer than 40km, so I don't have any experience. And we don't have any SHF expert locally... 1/ Do you think a permanent and stable 250 km link over the Mediterranean sea is doable ? Are some of you using such long links in 5 GHz ? If so, could you share your technical experience here ? 2/ Are there any people from Italy on this list ? Are there any volunteers between Genova and Roma to attempt a link with the East coast of Corsica ? If it works, would there be  an interest in establishing a permanent link ? Thank you for your comments, 73 de TK1BI