A first-class flight in a Soyuz space capsule is rocky, reliable and rather snug. An astronaut sits in a semi-fetal position, works the controls with a stick and feels a pretty heavy G load, especially on reentry.
So imagine if a fire breaks out on the Soyuz spacecraft. There’s no extinguisher, no exit and no help to call.
ESA astronaut Andreas Mogensen narrated a video showing he and Russian cosmonaut Sergei Volkov going through a simulated fire on a capsule to train for an upcoming flight to the International Space Station.