Scientists have developed solar panels that can function underwater at depths of up to 10 meters, a significant advancement in renewable energy technology. These panels are capable of capturing up to 324 milliwatt-hours (mWh) of energy at that depth, and each device is expected to operate effectively for about five and a half years before needing replacement. The research was conducted by a team from Yunnan University in China, who tested the panels in the South China Sea. They found that solar cells placed 32 feet (10 meters) below the water's surface could collect enough energy in just two hours to power lithium-ion batteries. This breakthrough opens new possibilities for using solar energy in underwater environments. The solar cells were made from a material known as lead halide perovskite, which is known for its efficiency in converting sunlight into electricity. To improve the performance of these cells, the researchers added a polymer called polyhexamethylene guanidine hydrochloride. This additive helped increase the effectiveness of the panels, allowing them to capture energy even in deeper water. Wen-Hua Zhang, one of the researchers from Yunnan University, noted that most previous studies on underwater solar cells have only focused on very shallow depths—typically two meters or less—which are not sufficient for practical applications. In laboratory tests, the solar panels demonstrated a power conversion efficiency of nearly 35%, which is quite high for solar technology. However, the amount of energy captured decreases with depth: the panels collected 1,416 mWh at two meters, 752 mWh at six meters, and 324 mWh at ten meters. The researchers believe these underwater solar panels could be used to power various devices, such as sensors, cameras, and communication systems, in marine environments. This could be especially useful for monitoring underwater ecosystems or supporting autonomous underwater vehicles. Despite the promising results, some challenges remain. For example, the panels might accumulate organic matter from marine life, a process known as biofouling, which could reduce their efficiency over time. This might require regular maintenance or cleaning to ensure the panels remain fully functional. However, the research team believes this innovation could lead to the practical use of perovskite solar cells in underwater settings, potentially enabling self-sustained marine energy systems and autonomous underwater devices.