Orca Keeps Circling Boat, Then A Passenger Sees What’s On Its Back

The machinery

There were two underwater drilling units, one surface excavator working on the rocks above the waterline, and a dredging barge running along the inner edge of the cove.

The operation was significant and running at full pace. Nobody on the platforms had yet noticed the Sea Scout or the orca moving steadily along just outside the cove entrance.