here, but there's so many different components that could have a failure issue. could you have had a pump up on the surface fail that was keeping the pressure of the mud that -- that's flowing down there, to keep the hydrocarbons at bay while you're putting the cement in. there's so many different variables where it could happen, but they were at the point where they were really getting the well bore itself ready for production, which is, you know, putting big steel pipes down there, putting cement down there, and believe it or not you can do cement underwater. letting it dry and then doing more sections, so they're in that process, and there's just so many moving parts where something could go wrong, one little piece of equipment. >> michael o'berry from the u.s. coast guard, chief petty officer, let's discuss for a second the safety issues that have to take place on an oil rig, because they're far from land and if something were to go wrong, it takes a while sometimes to get response, so they tend to be self-sufficient, whether it's a rig or a platform or drilling ship. they're pretty good about these safety drills. every shift gets a safety drill