Operations at Site 1195 (proposed site CS-10A) began when a beacon was dropped at 0700 hr on 26 January 2001. The corrected precision depth recorder reading indicted a water depth of 422.5 m.
Hole 1195A was spudded with the advanced piston corer (APC) at 0905 hr on 26 January and established a water depth of 419.9 m (Table T1 in the "Leg Summary" chapter; Tables T1, T2). When Core 9H was shot and advanced from 71.2 to 80.7 meters below seafloor (mbsf) with a full stroke and a normal pull of ~2.5 kilopounds (kips) was applied to the core barrel assembly as the driller picked up the drill string off bottom, all wireline weight was suddenly lost. The wireline was retrieved to the surface and found to have parted ~70 m above the wireline sinker bars. Attempts to fish the bottom-hole assembly with a wireline spear were unsuccessful and the drill string had to be recovered. The wireline had only nine runs on it since the last slip and cut of 150 m. A total of 620 m of wireline was removed from the aft winch as a result of the incident.
The results of operations in Hole 1195A were 80.7 m cored with 79.27 m recovered (98.2% average recovery). The APC temperature tool was deployed at 33.2 and 71.2 mbsf. Cores were oriented starting with Core 194-1195A-4H.
The vessel was offset 20 m east of Hole 1195A. In order to evaluate the magnetic overprint imparted by two drill bits, the standard 11 7/16 in APC/extended core barrel (XCB) bit used in Hole 1195A and a Russian-made 9.875 in APC/XCB polycrystalline diamond compact (PDC) bit, the latter was deployed in Hole 1195B. Hole 1195B was spudded with the APC at 2230 hr on 26 January. A water depth of 419.2 m was determined based on the drill string deployed and mudline recovered. Piston coring advanced to 207.9 mbsf, where 80 kips was required to retract a full-stroke core barrel. This was considered APC refusal depth. The Davis-Villinger temperature probe was deployed at 112.9 (following Core 12H) and 150.9 mbsf (following Core 194-1195B-16H). The cores were oriented starting with Core 194-1195B-3H. The average recovery for this portion of the hole was 101.1%.
XCB coring deepened the hole to a total depth of 521.2 mbsf. The XCB cored portion of the hole was 313.3 m with 189.29 m (60.4%) recovered. The total recovery for the hole was 399.5 m (76.7% of the cored interval).
Several attempts to lower the triple combination (triple combo) logging tool string out of the lower end of the pipe by gravity alone were unsuccessful. The tool string was finally pumped out of the pipe and subsequently lowered to within 2 m of the bottom of the hole without problems. For the second run, a successful check shot survey with the well seismic tool (WST) was considered of highest priority. In order to minimize the risk to that objective, it was decided not to run the Lamont-Doherty Earth Observatory (LDEO) natural-gamma spectrometry tool in the string. The WST also had to be pumped out of the pipe, but it wouldn't descend into the hole. The drill pipe became stuck in the process, and the WST was recovered to allow the drill string to be worked. After the drill sting was freed, a partial wiper trip was run to 230 mbsf to clear the obstructions in the hole. During the wiper trip, the drill string became stuck again and was only freed with overpull as high as 210 kips. As the driller pulled back the bit to the initial logging depth, the pipe became stuck again in the sand-rich formation. The bit was then set at 79 mbsf and the WST was run back in the hole, but it could not be lowered below 121 mbsf. Three levels were shot at 118, 95, and 86 mbsf using the air gun. No further downhole logging was attempted.
The drill string and beacon were recovered and the vessel began the short transit to Site 1196 by 2100 hr on 29 January.