STS080-317-018 (28 Nov. 1996) --- Astronauts Thomas D. Jones, with a hammer, and Tamara E. Jernigan, holding a crow bar, display just two of the tools they called on during an intense effort to open the space shuttle Columbia's hatch leading to the cargo bay. Scheduled Extravehicular Activities (EVA) for the two were canceled by NASA when all efforts to open the hatch were unsuccessful.