The third exploration

Similarly, as in the second exploration, Captain Ishii and his CHOEIMARU masterly took us to almost the same reefs as before. The weather was not so fine and the sea was rather rough. This time, however, we successfully obtained intended γ-ray spectra at 4 points shown in the figure. An underwater camera rightly took photos of growing seaweed at the bottom and of the bare base as well around Point 1.