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Gemini 6A - Launch-Abort

The first attempt to launch the 6A mission (second attempt for Gemini spacecraft No. 6) was on December 12, 1965 at 9:54 a.m. EST. All went well right up to ignition; the engines ignited, but after about 1.5 seconds of operation, they abruptly shut down. Since the clock had started in the spacecraft, mission rules dictated that Wally Schirra, as the commander, had to immediately pull the D-ring above the center console and activate the ejection seats, carrying the astronauts away from the disaster that would be the result of a fully fueled Titan II falling back onto LC-19. However, Schirra did not feel any movement and knew that the booster had not lifted, so he decided to not abort. His quick thinking probably saved the mission as the reliability of the Gemini ejector seats was questionable; the astronauts could have been badly injured from high g-forces as the seats had to launch them at least 800 feet, which was deemed a safe distance from an exploding Titan II. In addition, the cabin interior had been soaking in pure oxygen for hours. About 40 minutes after the aborted launch, the booster and spacecraft were safed and the service tower raised up to it. After removing the propellants from the Titan II, the booster was checked out and they quickly uncovered the main culprit, which was an electrical plug that dropped out of the base of the booster prematurely. Testing revealed that some plugs came out more easily than others, so they were replaced by different ones that would stay in place properly. Source: https://en.wikipedia.org/wiki/Gemini_6A