;’) Due to subsidence of the coastline, big chunks of the ancient city are now underwater. Herod’s little building project was a major engineering challenge, but produced a usable port, something in short supply along there.
Sounds like the city of New Orleans.
The darker outlines in the water, as evidenced by breaking waves, are outlines of areas which were likely above water or very shallow at some time in the past. It would not take much to envision this as a place where cargo vessels could be readily unloaded and would be somewhat protected from storms.