Fig. 4. Photo of the guide base of the C0016B artificial chimney taken from an altitude of 9.26m off the seafloor. The length of the sides of the triangular guide base in the right of the image are 5.31 m. seen 4.7m west of the artificial vent is a drill hole made during the IODP 331 expedition. The mouth of the hole is measured to be 2.17 m, with a depth of 1.35 m. Shinkaiacrosnieri are also seen inside the drill hole.