[gilbertbw]

It's only hydro-foiling on take-off and landing, in flight it's a plane in ground effect flying just above the sea.

[jongjong]

Tell that to the dolphins which swim along the shore line where the take offs and landings will be occurring.

[gilbertbw]

My point is that the lower risk for the majority of the journey will offset (partially or fully I do not know) the increased risk on take-off and landing. I would guess that the overall risk will end up lower for a WIG craft than a traditional high speed foiling vessel.

Also rocks are only a concern in a small area of ocean around the takeoff and landing areas, which will presumably be fairly well surveyed.