Captain Ishii and his CHOEIMARU masterly took us to almost the same reefs as before. The weather was fine and the sea was calm, as if it promised us a productive day. This time the cable, which connects the detector with the personal computer on the boat is 60 meters long enough to make up the drift of the boat. After the completion of measurements at Point 1, we moved to Point 2 and started another round. To our disappointment, signals from the detector didn’t come up well. Entirely an unpredictable problem this was.