American Nick Hague and Russian Aleksey Ovchinin were forced to return to Earth and landed in Kazakhstan when the booster stopped working during stage-one separation on their Soyuz rocket at approximately 50km (164,000ft) above the Earth.
Rescue teams near the Soyuz capsule that carried US astronaut Nick Hague and Russian cosmonaut Alexei Ovchinin after an emergency landing in central Kazakhstan Oct. 11, 2018.
This morning, the first launch since the possible sabotage was discovered, Russia's Soyuz booster saw its first in-flight failure in recent memory, and the first manned rocket-related emergency in decades.
In August, the crew found a hole in a Russian Soyuz capsule docked to the orbiting space station.
Glover, the NASA astronaut at the bar, received word that the astronauts were making a "ballistic descent", a much steeper and faster return to Earth than what is ideal - but that search-and-rescue crews were in contact with the astronauts.
The pair landed about 20 kilometers (12 miles) east of Dzhezkazgan, Kazakhstan.
All trips to the ISS and back are undertaken using Russian spacecraft, as has been the case since the Americans retired their shuttles in 2011.
NASA and Roscosmos officials say they are launching an investigation into exactly what went wrong with the rocket and why.
The latest failure yesterday, amid a long string of Russian rocket crashes, was another black eye for the Roscosmos space agency.
That could mean another launch before mid-December, when the three-member crew of the space station was scheduled to end their six-month mission.
This type of Soyuz rocket has been flying people to space since 2001, and until now, it has never failed, according to Space News. This incident will likely delay the scheduled mission of Canadian astronaut David Saint-Jacques, who was set to fly to the space station in December.
The U.S. and other nations have depended on Russian Federation to carry astronauts to the ISS since the retirement of the Space Shuttle program in 2011.
And it just goes to show that even the most seemingly routine rocket launch is never all that routine.
Russia's rockets are now the only way to get astronauts to the space station, but all manned flights have been out on hold in the wake of Thursday's accident.
The Russian Soyuz spacecraft is now the only vehicle for ferrying crews to the International Space Station following the retirement of the US space shuttle fleet. The hole caused a brief loss of air pressure before being fixed. -Russian co-operation in space, voicing hope that it wouldn't be affected by politics.