Dualla’s knife

In Season 2′s “Flight of the Phoenix“, the future Sharon Agathon—then known as “Caprica-Boomer” or “Caprica-Sharon”—saves the Fleet from certain destruction after a Cylon virus enters Galactica‘s systems. (The virus itself infects the ship in “Scattered“, when Colonel Saul Tigh essentially loses the Fleet and is forced to network Galactica‘s systems in order to recompute the coordinates that the Fleet had jumped to, while simultaneously attempt to survive an entanglement with a Cylon basestar in orbit around Kobol.)

In order to save the ship, Sharon cuts a fiber optic connection to the ship and then cuts an opening in the palm of her hand, so as to access Galactica‘s systems, hoping to contain the virus while Dr. Gaius Baltar and Junior Lieutenant Felix Gaeta simultaneously wipe the ship’s hard drives. In order to cut open her hand, Sharon asks Dualla for the knife that Dualla received from her father. Despite the argument that Dualla had with her father before the Fall of the Twelve Colonies (as she herself reveals in her interview to D’Anna Biers in “Final Cut“, Dualla carries this knife with her, which she gives to Sharon at Commander Adama‘s behest.