SS1 is a designation for a specific type of submarine, known as a "submersible." These vessels are designed to operate underwater and can be used for various purposes, including research, exploration, and military operations. SS1 submarines are typically equipped with advanced technology to navigate and communicate while submerged. The SS1 class is often associated with naval forces and oceanographic research. They can carry a small crew and are capable of reaching significant depths. Their design allows for stealthy movement, making them valuable for both scientific studies and strategic military missions.