2007 December 6 (Day 21)
Weather: Fine but Cloudy
Site: C0001 (NT2-03) (33°14’ N, 136°42’ E)
Science Operations on Deck: Continued drilling from 425 meters blow seafloor (mbsf) with RCB assembly with center bit at the Hole C0001I. Having several times small stuck (high torque), repeated washing and reaming down to 520 mbsf.

Science Operations in Labs: Core–log–seismic integration specialist found the good correlation between natural gamma ray measurements of core samples and GR data of LWD in the upper sequence. Science party had a seminar on subduction input of the Nankai Trough by Prof. Mike Underwood.