Ví dụ công khai
Dr. Collingwood, in his "Rambles of a Naturalist," describes a scene of marvellous submarine beauty in the China seas. He speaks of Fiery Cross Reef on a day when the sea was so calm that the ship’s anchor could be distinctly seen sixty or seventy feet from the surface. Rowing over a two-fathom patch, he allowed the boat to drift slowly, and gazed on the sea treasures beneath him.