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Emergency spacewalk outside ISS underway; NASA astronauts Peggy Whitson and Jack Fischer take the reigns – Watch LIVE

Emergency spacewalk outside ISS underway; NASA astronauts Peggy Whitson and Jack Fischer take the reigns – Watch LIVE

The failed relay box was installed in the space station truss March 30 during a spacewalk by Whitson and Expedition 50 commander Shane Kimbrough.

NASA astronauts all set for emergency spacewalk outside International Space Station today

NASA astronauts all set for emergency spacewalk outside International Space Station today

Expedition 51 Commander Whitson and Flight Engineer Fischer will replace a critical computer relay box that failed May 20. 

Emergency spacewalk: Here's why NASA astronauts will venture outside space station on Tuesday

Emergency spacewalk: Here's why NASA astronauts will venture outside space station on Tuesday

The multiplexer-demultiplexer (MDM) data relay box on the S0 truss failed on Saturday morning.

Astronauts Peggy Whitson and Jack Fischer conclude 200th spacewalk!

Astronauts Peggy Whitson and Jack Fischer conclude 200th spacewalk!

The spacewalk was the ninth of Whitson's career. She holds the record for most spacewalks by a woman.

Historic 200th spacewalk delayed after NASA discovers water leak!

Historic 200th spacewalk delayed after NASA discovers water leak!

Spacewalks usually last about six and a half hours, but Friday's would be "abbreviated" due to the late start and would last about four hours.

Expedition 51 astronauts perform 200th spacewalk outside International Space Station!

Expedition 51 astronauts perform 200th spacewalk outside International Space Station!

ISS astronauts Peggy Whitson and Jack Fischer are venturing outside the space station to replace a large avionics box that supplies electricity and data connections to the science experiments, and replacement hardware stored outside the station.

Spacewalkers successfully connect adapter for commercial crew flights - Watch

Spacewalkers successfully connect adapter for commercial crew flights - Watch

Expedition 50 Commander Shane Kimbrough and Flight Engineer Peggy Whitson of NASA, who concluded their spacewalk at 2:33 p.m. EDT, successfully reconnected cables and electrical connections on the Pressurized Mating Adapter-3. 

Spacewalk mishap: Astronauts lose important piece of space station's protective shielding

Spacewalk mishap: Astronauts lose important piece of space station's protective shielding

The piece of shielding the astronuats lost, protects against micrometeorite debris and was one of four pieces that Whitson and Kimbrough were installing over the spot left by a relocated docking port.

NASA Astronaut Peggy Whitson makes history, breaks record for most spacewalks by a woman!

NASA Astronaut Peggy Whitson makes history, breaks record for most spacewalks by a woman!

Whitson along with Expedition 50 Commander Shane Kimbrough of NASA will reconnect the cables and electrical connections on PMA-3 at its new home on top Harmony.

ISS astronauts Shane Kimbrough, Peggy Whitson to conduct second spacewalk on Thursday!

ISS astronauts Shane Kimbrough, Peggy Whitson to conduct second spacewalk on Thursday!

Two astronauts will conduct the second spacewalk outside the International Space Station (ISS) on Thursday, March 30.

Astronauts Shane Kimbrough,Thomas Pesquet complete spacewalk

Astronauts Shane Kimbrough,Thomas Pesquet complete spacewalk

US station commander Kimbrough, 49, and French flight engineer Pesquet, 39, floated outside the station`s airlock as the $100 billion complex soared 250 miles (402 km) above Earth.

 ISS upgrade: Astronauts Shane Kimbrough and Thomas Pesquet begin spacewalk — Watch

ISS upgrade: Astronauts Shane Kimbrough and Thomas Pesquet begin spacewalk — Watch

Two astronauts are spacewalking outside the International Space Station (ISS) on Friday for upgrading the orbiting lab for the arrival of future space crews.

Expedition 50 astronauts take spacewalk outside space station – Watch Live

Expedition 50 astronauts take spacewalk outside space station – Watch Live

The six-and-a-half hour spacewalk is scheduled to begin about 8 a.m. EDT, Friday, and NASA TV will provide complete coverage beginning at 6:30 a.m. EDT.

IN PICS: French astronaut Thomas Pesquet had the time of his life during his debut spacewalk and it shows!

IN PICS: French astronaut Thomas Pesquet had the time of his life during his debut spacewalk and it shows!

Pesquet's career's debut spacewalk was performed alongside NASA astronaut Shane Kimbrough and if the images he shared later are anything to go by, looks like he had the time of his life.

ISS astronauts Shane Kimbrough and Thomas Pesquet mark spacewalk completion with an orbital high-five!

ISS astronauts Shane Kimbrough and Thomas Pesquet mark spacewalk completion with an orbital high-five!

Since this was Thomas Pesquet's first ever spacewalk, both astronauts celebrated the success in a fun way – by cheering each other with a high-five!

NASA makes people try on spacesuit gloves and learn what it feels like to perform a spacewalk the hard way!

NASA makes people try on spacesuit gloves and learn what it feels like to perform a spacewalk the hard way!

The video goes on to explain that astronauts don't make use of their feet since they are in a zero gravity atmosphere.

ISS astronauts Shane Kimbrough, Thomas Pesquet's second spacewalk of 2017 - Watch it LIVE

ISS astronauts Shane Kimbrough, Thomas Pesquet's second spacewalk of 2017 - Watch it LIVE

This is the 197th spacewalk in support of space station assembly and maintenance.

ISS astronauts Shane Kimbrough and Thomas Pesquet gear up for second spacewalk of 2017 to be performed on January 13!

ISS astronauts Shane Kimbrough and Thomas Pesquet gear up for second spacewalk of 2017 to be performed on January 13!

The second phase of the spacewalk is going to be staged on Thursday, January 13 and will be once again performed by astronaut Shane Kimbrough and joining him this time, would be ESA astronaut/flight engineer Thomas Pesquet.

At 56, courageous Peggy Whitson becomes oldest woman to perform spacewalk

At 56, courageous Peggy Whitson becomes oldest woman to perform spacewalk

At 56, Peggy walked in space for nearly 6.5 hours, setting several records.

Missed the first spacewalk of 2017? Here's video for you to watch

Missed the first spacewalk of 2017? Here's video for you to watch

Expedition 50 Commander Shane Kimbrough and Flight Engineer Peggy Whitson of NASA have completed the first of two power upgrade spacewalks on January 6, 2017.