*Koichiro Fujinaga1,2, Kazutaka Yasukawa2,1, Shiki Machida3,2, Tatsuo Nozaki3,2, Yutaro Takaya4,2, Junichiro Ohta2, Kazutaka Oya2, Daiki Niikuma4, Yoshiro Nishio5, Yuka Masaki3, Yoichi Usui3, Satoru Haraguchi3, Koichi Iijima3, Hiroshi Amakawa3, Katsuhiko Suzuki3, Kentaro Nakamura2,3, Yasuhiro Kato2,3,1, MR15-E02 Leg.2 cruise members
(1.Chiba Institute of Technology, 2.Department of Systems Innovation, School of Engineering, University of Tokyo, 3.Japan Agency for Marine-Earth Science and Technology, 4.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University, 5.Research and Education Faculty, Kochi University)