Rocket failure during launch countdown

In 1983, during the Soyuz T-10-1 mission, a valve on the rocket's propulsion line failed to close properly 90 seconds before the final countdown, causing a fuel leak that ignited at the base of the rocket. The fire spread silently, and the crew inside the spacecraft did not immediately realize the danger.

Loss of automatic ejection system

As the fire consumed the rocket's structure, the cables connecting it to the control center burned away, disabling the automatic ejection trigger system. This meant the rocket could not save its occupants, and two ground controllers had to manually trigger the ejection via radio, bypassing the usual system.

Emergency ejection sequence

When the ejection order was executed, explosive bolts separated the habitable modules from the service module and the upper part of the nose cone from the rest of the launcher. In a few fractions of a second, the capsule containing cosmonauts Vladimir Titov and Guennadi Strekalov tore away from the rocket, propelled by emergency motors.

Survival through extreme forces

The forces experienced by Titov and Strekalov during the ejection were estimated to be between 14 and 17 g for about five seconds. Strekalov recognized the situation was worsening from the noises and tightened his harness, urging Titov to do the same just before the rocket exploded.

Aftermath and historical significance

The rocket exploded two seconds after the ejection, destroying part of the launchpad. The capsule landed about 4 kilometers from the launch site, and the cosmonauts emerged with only minor injuries. This event marked the first real use of an ejection system in an emergency during a manned space flight. The Soviet engineers had designed an automatic system, but its failure and the quick action of ground controllers allowed the ejection to be manually triggered in time.