A naval base in Karachi, Pakistan holds a secretive submarine used by the country’s Navy SEALs. This submarine is small in size with a length of only 55 feet, a fraction of the size of a normal sub. It was designed to specifically be used by the Navy SEALs, also known as Pakistani Navy’s Special Service Group, who have been known to train with their U.S. counterpart. While we don’t have a specific name for the sub it falls under the X-Craft Navy parlance. The U.S. equivalent of this category would be the Dry Combat Submersible being used by SEALs. Currently the only clear image of the craft in the water was taken in 2016 when the existence of the submarine was first known.