Shenzhou 4 The spacecraft was equipped for a manned flight, even featuring a sleeping bag, food, and medication. The windows were constructed of a new material that was designed to stay clear even after reentry to allow an astronaut to confirm that the parachutes have deployed properly. It was said that the spacecraft flown on Shenzhou 4 had no major differences to that used on Shenzhou 5. It flew with the ability for manual control and emergency landing, systems needed for a manned flight. A week before the launch, astronauts trained in the spacecraft to familiarise themselves with its systems.