ISS Flight Engineers Chris Cassidy and Luca Parmitano are set to commence a spacewalk on the ISS today starting at 8:10 ET. The pair will undertake the final installation of bypass jumpers, providing essential power redundancy to critical components. Other tasks to be completed on the walk include replacing a video camera, relocating wireless television kit and performing vital checks on component door covers. This will be the fifth spacewalk performed on the ISS this year, and the 171st in support of the station overall. You can watch the preliminaries right now, or head back at 8:10 to catch the action.
Update: As those watching will be aware, the spacewalk wound up being cut considerably short due to a water leak in astronaut Luca Parmitano's helmet that required him to be assisted back inside the space station.