16 November, 1999
On to the drill site! The Cape Roberts Project drill site is located about 12 kilometers (a bit over 7 miles) away from CRP base camp out on the sea ice of the Ross Sea. Work at the drill site began in October when all of the equipment was dragged on to the ice on skids by bulldozers. The entire drill rig and the base camp were stored on land during the winter before being put into place on the ice. The route from the base camp to the drill site is not a straight line. A safe path must be found by winding around icebergs frozen in the sea ice, avoiding rough ice, and crossing at stable places in the many cracks. The rig is located over about 300 meters of water and needs about 2 meters (6 feet) of ice to support it. As one approached the rig from the air, it looks like a smaller version of a traditional drill rig. It is enclosed at the base with the derrick extending above the rig. The drill pipe consists of a donut shaped bit on the end of a string of rotating pipe. The bit has diamonds imbedded in it to allow the bit to chew away at the rock. As the bit spins, it forces a shaft of rock into a metal sleeve inside the drill pipe. At regular intervals, this "core" of rock is pulled out of the pipe and a new sleeve is inserted. As the bit goes deeper into the rock, more drill pipe is added at the drill rig. Occasionally the drill bit wears out and needs to be replaced. A lot of things can go wrong in this process. The drill rod can break, they can hit layer of very hard rock or there can be other mechanical problems. So far, the CRP drilling has gone very well. They have drilled over 840 meters into the sea floor. This is a record for Antarctic drilling. Add to this the 300 meters of pipe to get to the bottom of the sea and you have over a kilometer of drill pipe hanging from this rig on the ice. To help support this tremendous amount of weight, there are floatation devices and air bags attached to the drill pipe. In addition, there are two large air bags under the ice directly under the rig to support it's weight.
The drilling crews work 12-hour shifts. At the end of the shift they are flown back to the base camp by helo (Unless there is bad weather, then they have to go over the ice.). Drilling continues 24/7. During their 12 hours off, the crew eats, relaxes and gets some sleep. Then it's back to work. The scientists at the drill site work the same schedule. The cores are delivered from the rig to the geologists in the core processing building. Here the core is analyzed, electronically imaged and cut in half. One half of the core will be used to take samples from while the other is stored for later study. The cores are then flown back to the base camp where they are studied and described by geologists there. After this initial study, cores are flown back to McMurdo where technicians, like me, and scientists can process, analyze and study samples of the core material.
One of the ways they make sure the drilling goes smoothly is by using a special camera that can see the entire drill string from just below the ice all the way to the bottom of the sea. This camera system is located in a small building next to the drill rig. The camera is lowered into the water through a large hole cut in the ice. The drilling operation can be monitored with this camera. In addition to the camera equipment, a large seal has taken up residence in the hole. The people at the drill site have named him Frank. While I was in the video shack watching the monitor, Frank stuck his head out of the hole to get air. His breath smelled of fish! I got a good picture of Frank.
At the end of our tour of the drill site, we headed back to the base camp via a Hagglund, a two-piece, tracked vehicle. We got back in time for lunch. I then had the opportunity to visit some really cool ice caves. I will tell you about those tomorrow.
Today's featured CRP Team Members represent the drillers that work at the drill site. They are Todd Symons from Townsville in Queensland, Australia and Jeremy Ridgen from Greendale, New Zealand. Both Todd and Jeremy will continue work at other drill sites around the world when the CRP is done, as will most of the drill crew.
Special note to those of you doing the evaporation experiment. I continue to have problems with the water eating holes in my aluminum plates. Are any of you having this problem? I am going to have to start over with a new, perhaps plastic, container. You keep going with your experiment if you have started. We can still compare data when we are all done.
Contact the TEA in the field at .
If you cannot connect through your browser, copy the TEA's e-mail address in the "To:" line of your favorite e-mail package.