4-Tom Swift and His Oceanic SubLiminator

When a brand new nuclear submarine suddenly disappears during sea trials, Tom Swift is asked to help find and salvage her. He saves her crew and devises a way to bring her back up from a watery grave. But, when the Navy asks him to become involved in an effort to locate and recover several lost U.S. and Soviet nuclear subs, he may have taken on more than he can handle. With a mixed Enterprises and Navy crew, he take a massive recovery submarine deep under the ocean and into danger. An old nemesis appears with a mysterious submarine; a submarine that isn't supposed to exist. With the ghost sub after them, Tom and his crew make a startling and dangerous discovery deep below the polar ice.