The Battle of Vorkado was a military conflict contained in The Doctor's tactical database after his upgrade to the Emergency Command Hologram, in which a Romulan captain disabled two attacking vessels by creating a photonic shockwave between the ships by detonating a photon torpedo with a directed-energy weapon. In 2377, The Doctor utilized this same tactic to disable two Quarren patrol ships which were pursuing the USS Voyager, creating a photonic shock wave by detonating a torpedo with a phaser blast. (VOY: "Workforce, Part II")