In the gulf, looks like a tunnel runs out to this rig and then on out to a pipe with a hatch. Must have been full of victims.
Oops, missed the last pic
I request anons verify themselves. Google maps won't show it. I used the Earthquakes Tracker app. As you zoom in on the second blacked out area to the north, you will get water surface instead of bottom contour. The rig is in the lower left, and the pipe extends to the north, surfacing to the west of the lower island.