Actress Kate Mara reveals she and her co-stars wore the suits for days and there was no time to slip out of them for toilet breaks.

And their mircophones stayed on!

She states, "It was torture... We could just hear each other talking, so if you go and get a coffee or you go and take a pee, we can hear each other doing that.

"It was like, 'Whoever is taking a s**t right now, please quiet down!'"

The film, adapted from Andy Weir's book, also features Jessica Chastain, Matt Damon, Michael Pena and Sebastian Stan as astronauts on a mission to Mars.