Aboard the sub was a squad of Special Boat Service men. One of them showed her a place where an extra pod had been welded onto the hull of the submarine, like a wen on a camel. This could be accessed through a system of hatches. Olivia was quite certain that it was the most expensive single object she had ever seen in her life. The pod was a tiny submarine, capable of holding up to half a dozen men. "Or five men and one woman, if it comes to that," the SBS man said. In some ways it was a simple vessel. It was not made to be filled with air or to withstand the pressure of the ocean. The seawater filled it, and the occupants wore scuba gear. But in other respects it was loaded with what she took to be fantastically complex navigation and stealth technology.