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On-site observation of the seafloor in the SMT. Photos were taken by Shinkai 6500 (JAMSTEC, Japan) in 2010. (A) A black smoker chimney at the Archaean site, (B) a black smoker chimney at the Pika site, (C) diffuse flows from crack of pillow lavas at the Snail site, (D) iron-rich mats at the Snail site, and (E) a casing pipe inserted into a borehole at the Snail site.
