Imagine waking up aboard the International Space Station only to discover that you are completely alone. Every communication attempt with Earth fails, and there is no rescue mission on the way. The ISS, once a bustling laboratory filled with astronauts, has suddenly become your permanent home.At first, survival might not seem impossible. The station has food, water recycling systems, living quarters and exercise equipment. But as the days turn into months, staying alive would become a challenge unlike anything humanity has ever faced.Your first priority would be taking inventory of the available supplies. Normally, six astronauts carry enough food to last about three months, but with only one person aboard, those same supplies could stretch well beyond a year. Careful rationing would become essential, with every meal planned to avoid wasting precious resources.You could even grow fresh vegetables using the station’s plant growth systems, helping extend your food supply while providing valuable nutrients that packaged meals cannot fully replace.Water would be one resource you would not have to worry about immediately. The International Space Station has one of the most advanced recycling systems ever built, recovering moisture from the air as well as wastewater to produce clean drinking water.It may sound unpleasant, but astronauts have trusted this system for years because it produces water that is often cleaner than many supplies found on Earth. As long as the equipment continued working properly, you could remain hydrated indefinitely.Daily life, however, would become increasingly uncomfortable. The station’s famous multi million dollar toilet would still require you to use suction systems designed for microgravity, making even simple bathroom visits a carefully controlled process. Showers do not exist aboard the ISS, so you would rely on small amounts of water, wet towels and no rinse shampoo to stay clean.In weightlessness, sweat does not drip off your body but instead forms floating droplets on your skin, making personal hygiene feel very different from life on Earth.Your body would also begin changing almost immediately. Without gravity constantly pulling on your muscles and bones, they would gradually weaken over time. Astronauts already lose muscle mass and bone density during long missions, even while following strict exercise routines.To slow these effects, you would need to spend several hours every day using the station’s treadmill, exercise bike and resistance machines. Skipping workouts for even a short time would allow your physical condition to decline much faster.While your body struggled with microgravity, your mind would face an even greater challenge. Knowing that you were the last human alive would create overwhelming feelings of grief, loneliness and uncertainty. With no conversations, no messages from family and no hope of returning home, anxiety and depression could become constant companions. The psychological effects of total isolation might eventually become just as dangerous as any physical health problem.Keeping the station operational would require constant effort. The ISS depends on regular maintenance, inspections and repairs to keep its systems functioning safely. Normally, multiple astronauts divide these responsibilities, but alone you would have to manage every task yourself.As equipment gradually failed and repairs became more difficult, the station would slowly become less reliable. Eventually, without enough maintenance, its orbit would begin to decay, causing it to fall back toward Earth.You might wonder whether escaping to Mars would offer a better future. Unfortunately, the International Space Station was never designed for deep space travel. It lacks the engines, fuel capacity and radiation protection needed for a journey to another planet. Even if enough fuel somehow existed to leave Earth’s orbit, the station could not safely carry you across millions of kilometers of open space.The intense radiation beyond Earth’s protective magnetic field would also pose a serious threat to your survival.Realistically, you could survive aboard the ISS for a year or even longer if supplies and critical systems continued functioning. Eventually, however, aging equipment, limited resources and the emotional toll of complete isolation would catch up with you. The International Space Station is an extraordinary engineering achievement, but it was never meant to support a single person forever. It was built to help humanity explore space together, not to become the final refuge of the last person left alive.