Two Expedition 36 astronauts will venture outside the International Space Station Tuesday on the first of two July spacewalks to prepare the orbiting complex for a new Russian module and perform additional installations on the station’s backbone.

Flight Engineers Chris Cassidy of NASA and Luca Parmitano of the European Space Agency are slated to begin the 6 1/2 hour spacewalk from the Quest airlock at 8:10 a.m. EDT Tuesday. Live NASA Television coverage of the excursion begins at 7 a.m.