It involved a rocket that was not designed by Korolev, and was not necessary for the Vostok programme; the rocket was by rival designer Mikhail Yangel, intended to be a new generation of intercontinental ballistic missiles. It would be two weeks before work on the Vostok programme continued, and it was realised that the original target of a December crewed launch was unrealistic. On December 1, 1960, the next "Vostok 1K" spacecraft, called Korabl-Sputnik 3 by the press, was launched. It carried the two dogs Pchyolka and Mushka. After about 24 hours, the engines were intended to fire to begin re-entry, but they fired for less time than had been expected. This meant that the spacecraft would enter the atmosphere, but not over Soviet territory. For this reason the self-destruct system was activated, and the spacecraft and the two dogs were destroyed. At the time, the press reported that an incorrect altitude caused the cabin to be destroyed upon re-entry. The next "Vostok 1K" spacecraft was launched on December 22, 1960, but it was unnamed because it failed to reach orbit. It carried two dogs, named Kometa and Shutka. The third stage of the launch system malfunctioned, and the emergency escape system was activated. The spacecraft landed 3,500 kilometres downrange of the launch site. The resulting rescue operation took several days, in -40 °C conditions. After a few days, the dogs were both recovered alive, and the spacecraft was returned to Moscow a few weeks later. Despite Korolev's desire to announce this failure to the press, the State Commission vetoed the idea. The two uncrewed missions immediately preceding the first human flight used the same spacecraft design as in the crewed missions, a design called "Vostok 3KA" (or "3A"). The only differences were that they would carry a single dog into orbit, a life-size mannequin would be strapped into the main ejection seat, and (unlike the crewed missions) they had a self-destruct system. The recent failures of Vostok 1K were not encouraging, but it was decided to proceed with launches of an automated variant of "Vostok 3KA", the spacecraft design that would conduct a human spaceflight. The approval of a crewed mission was contingent upon the success of the two automated "Vostok 3KA" missions. Unlike the previous "Vostok 1K" flights, the two uncrewed "Vostok 3KA" flights were planned to last only a single orbit, to imitate the plan for the first human flight.