*Yuka Masaki¹, Hideki Sezoko², Masayuki Nagayama³, Wataru Tanikawa⁴, Yuhji Yamamoto⁵, Shinichiro Ito¹ (1.COSMOS SHOJI Co., Ltd., 2.Nippon Marine Enterprises, Ltd., 3.360 Planet, 4.Japan Agency for Marine-Earth Science and Technology, 5.Kochi University)