Astronaut Scott Kelly: How to survive a year in space

Astronaut Scott Kelly tells the BBC how he managed to live for a year on the International Space Station and why, four years into his retirement from Nasa, he would go back if someone asked.

It's 16 July 2015, and all three occupants of the International Space Station are squeezing into the Russian Soyuz spacecraft that acts as their lifeboat in the event of an emergency.

The crew members have been told by mission control that a large, defunct satellite is hurtling their way at 14km per second. Controllers know it will come close, but they can't track the object precisely enough to know if it will skim by or score a devastating bullseye.

US astronaut Scott Kelly and Russians Gennady Padalka and Mikhail "Misha" Kornienko hunker down in the cramped capsule, waiting for the speeding hunk of metal to close in, following the procedures drawn up for such an eventuality by preparing to detach from the station at a moment's notice and return to Earth.