GH,
Here you go about that community with infrastructure underground and which suffered no outages and very little damage.
Not mentioned in this piece is what underground infrastructure consists of in the Keys and near shore Real Estate on the mainland over the Biscayne Acquifer: subsidence (land sinking) due to sea water pushing up through our coral rock base (which turns to sponge cake eventually).
For instance, the Florida Keys has now sunk miles and miles of new sewage pipes so that all homeowners would abandon leaky cesspits which pollute near shore waters. Whenever the trenches for these sewer pipes were dug, crews had to run humongous water pumps to extract sea water from the saturated coral rock mush under ground.
Were we to build a ten foot wall around all the archipelago of the Florida Keys, every connected Key (island) would become a saltwater swimming pool with sea water pushing up through the ground.