One small step for mankind begins with one dangerous decision for astronaut Neil Armstrong (Ryan Gosling) in "First Man."

The second trailer for the biopic plays up the dangers of Armstrong's mission to the moon. To get there, he and NASA's finest minds first have to figure out the "how" of it all — without blowing up Armstrong and his Apollo 11 team members.

"We need to fail," Armstrong says. "We need to fail down here so we don't fail up there."

More than the first trailer, this one lays out the incredibly high bar NASA engineer's have to clear for everything to go perfectly. It also highlights the stakes involved, with Armstrong's wife (Claire Foy) and child waiting for him patiently back on Earth and hoping he makes it back.

Jason Clarke, Kyle Chandler, Patrick Fugit, Ciaran Hinds, and Ethan Embry also star.

"First Man" opens in theaters October 12.