People are not able to scuba dive to the deepest parts of the ocean, such as the Challenger Deep in the Mariana Trench, due to the extreme conditions and technical challenges involved. The primary obstacle is the immense water pressure that increases exponentially with depth. At the Challenger Deep, for instance, the pressure is about 1,000 times greater than at sea level, which would crush conventional scuba equipment and pose a severe threat to human safety.
Additionally, the freezing temperatures, limited visibility, and the need for extensive air supplies make it practically impossible for scuba divers to reach such depths. Traditional scuba gear is not designed to withstand these extreme conditions, and alternative technologies, like submersibles or remotely operated vehicles (ROVs), are required for deep-sea exploration. These specialized vehicles are engineered to withstand the pressure and provide life support systems for researchers and explorers to study the mysterious depths of the ocean.