We hit another snag today, as we discovered that the mill bit and the 10-foot length of stiff pipe it is attached to separated from the rest of the drill string yesterday. It appears that the bit cut much of the casing, but expired before it could get through the bend and into the rock below. When the bit would no longer cut but continued to rotate, it stressed the stiff rod threads until they stripped, and the lengths of pipe separated. We are confident that we have grabbed onto this fish, but will have to wait until tomorrow to recover it at the surface. Then we will attach a new mill bit, weld the stripped rods together, and trip down again to finish drilling through the casing.