The two spacewalkers also removed an experiment called Kromka situated near one of the thruster groups and installed a virtually identical new Kromka experiment in the same place. The experiment captured material that results from thruster firings. Onufrienko and Bursch also attached a physics experiment called Platan to the Zvezda module. Platan was designed to capture low-energy heavy nuclei from the sun and from outside the solar system. In addition, they installed three materials experiments, called SKK for their Russian acronym, on the Zvezda module. The experiments examine effects of the harsh environment of space on a wide range of materials. The spacewalk lasted 5 hours and 59 minutes.