VIDEO: Cosmonauts Slice Spacecraft For Clues To Cause Of Mysterious Hole

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.

A small hole in spacecraft Soyuz MS-09 has sparked an investigation into its origin. Cosmonauts spent hours on a spacewalk to gather samples in hopes of determining its cause.

(Image credit: AP)