Floating cable-stayed bridge
A floating cable-stayed bridge is a type of cable-stayed bridge where the towers float on tension-leg submerged material, tethered to the seabed for buoyancy. No floating cable-stayed bridge has been made or planned as of 2025, but a floating suspension bridge was planned in Norway before being turned into a floating pontoon bridge and conventional cable-stayed bridge.
Source: Wikipedia — Floating cable-stayed bridge (CC BY-SA 4.0)