"It’s a lot like on a submarine when you’re going out into the water, except the difference is you’re going out into the vacuum of space."
A SpaceX Falcon 9 rocket is about to carry what will soon become the International Space Station's first privately-built airlock.
The airlock, called Bishop and built by aerospace company Nanoracks, is designed to get payloads from inside the space station into the openness of space.
The company has previously built standardized boxes for space-based experiments and tiny satellite deployers, The Verge reports.
The Bishop is shaped like a bell jar and attaches itself to the outside of the space station using a number of clamps and latches.
"Once it’s there, it’s just extra real estate until we want to use it," Mike Lewis, Nanoracks’ chief innovation officer, told The Verge. "We can use it in a number of ways, the first of which is to bring things outside."
First, payloads — Nanoracks is planning for the airlock to primarily deploy satellites — are attached to the inside of Bishop. Astronauts then close the hatches, remove the air inside the airlock. A robotic arm detaches the entire assembly from the space station afterward.
"It’s a lot like on a submarine when you’re going out into the water, except the difference is you’re going out into the vacuum of space," Lewis told The Verge.
Two out of the space station's existing three airlocks currently allow people to leave the station. One, the Japanese Experiment Module, allows for payloads to be released.
Japanese startup GITAI is already planning to test out its robotic arm inside Nanoracks' airlock.
Bishop is headed to the space station as soon as mid-November.
READ MORE: The first commercial airlock is heading to the International Space Station later this year [The Verge]
More on the ISS: NASA Still Hasn't Found the Damn Leak on the Space Station