geological, geochemical, and microbiological analyses to explore the geosphere-biosphere interactions occurring within a submarine mud volcano off the coast of Japan. Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex Ijiri A, Inagaki F, Kubo Y, Adhikari RR, Hattori S, Hoshino T, Imachi H, Kawagucci S, Morono Y, Ohtomo Y, Ono S, Sakai S, Takai K, Toki T, Wang DT, Yoshinaga MY, Arnold GL, Ashi J, Case DH, Feseker T, Hinrichs K-U, Ikegawa Y, Ikehara M, Kallmeyer J, Kumagai H, Lever MA, Morita S, Nakamura K, Nakamura Y, Nishizawa M, Orphan VJ, Røy H, Schmidt F, Tani A, Tanikawa W, Terada T, Tomaru H, Tsuji T, Tsunogai U, Yamaguchi YT, and Yoshida N SCIENCE ADVANCES June 2018 ü Deep Life ü Deep Energy ü Field studies