Russian cosmonaut Oleg Kononenko performs a spacewalk outside the International Space Station on Tuesday. Kononenko and Sergei Prokopyev are inspecting a section where a mysterious leak appeared on Aug. 30.

Russian cosmonaut Oleg Kononenko performs a spacewalk outside the International Space Station on Tuesday. Kononenko and Sergei Prokopyev are inspecting a section where a mysterious leak appeared on Aug. 30.