In the 27th novel of this new series, Tom is now back from his adventure on Neptune and had a small mission to accomplish before he feels the previous one is complete. His small unmanned test submarine was lost on its deep sea test in the region of the Mariana Trench south of Guam, and now he wants to go get it back. Nothing is as easy os it sounds, and he must find a way to get Yamato II down to Earth before it can be used.Even when he succeeds (and...