The first step in the process of getting unstuck went very well today. The pipe was successfully ""backed off"" one section of drill pipe below the drilling jars at a depth of 11,658', as intended. About 350' of pipe, and the bit, are left in the hole. We know from the logging-while-drilling data that the section of the hole that contains ""the fish"" was in good shape at the time it was drilled (the hole size was almost everywhere in gauge). There are several sections of enlarged hole, but these extend over relatively short intervals. We are tripping into the hole with heavy duty jars, an intensifier and bumper sub to try to retrieve the fish.