I was using the strava heat map to see if there was any underground tunnels. using the watersports data apparently there is a big loop of tunnels. It gets weirder too because it ends at what i now see is a gated aparment complex. did a little digging on the property, apparently it has 5302 detached garage units. with only 55 or so apartments.https://archive.vn/lSXxl#selection-11803.0-11803.5 it has these garage things i think they are going underground with. and beyond that there is shriner colors and keystone facade's on every arch. its called beachside apartments. beachsideapartments.com