Safer Ships

It seems to me that the safest kinds of boats or floating islands would be to use materials that are naturally buoyant, like plastic.  A breached hull would be less catastrophic.  Thin sheets use very little plastic, but we don’t see thick structures made out of plastic as much.

Metal is prone to rust around water.  Glass is not prone to rust, but is not very buoyant.  I wonder if a foam of glass is possible?

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