Times have changed. The Great War is over and money is getting hard to come by. Mr. Damon shows up with a new friend, who promises wealth from the bottom of the sea. Tom reluctantly agrees to join the search for the sunken steamship SS Pandora and a million dollars in gold coin.Like the Greek legend, the strong box on the Pandora contains much more and less than the treasure seekers expected.

A Mr. Dixwell Hardley approaches Tom with a proposition to help recover sunken treasure. Mr. Hardley was on board a ship which was carrying gold to help finance an illegal revolution. When the ship sank, Mr. Hardley overheard the captain recording the coordinates. Now he wants Tom's help to recover the gold, under the guise of both financing the expedition as well as rewarding Tom with a portion of the recovered treasure. Unfortunately for Tom, after agreeing to the expedition, he learns that Mr. Hardley is a con-artist, who recently scammed someone out of the oil well rights. Making matters worse, the victim is Barton Keith, a relative of Mary Nestor. Rather than cancel the expedition, Tom decides to carry on in the hopes of restoring Mr. Keith's claims to the oil wells.

Tom Swift and his friend accept an assignment to salvage treasure from a wrecked ship.

Victor Appleton was a popular author in the 20th century, but Victor was not a single individual. instead, that name was used as a pseudonym by the Stratemeyer Syndicate to put out the popular Tom Swift series.

Tom Swift, Jr., and his friend, Bud Barclay, try to recover a missile, which was mysteriously thrown off course, containing valuable data from Jupiter.

Victor Appleton was a house pseudonym used by the Stratemeyer Syndicate and its successors, most famous for being associated with the Tom Swift series of books. The following series have been published under the Victor Appleton name: Tom Swift (1910-1941), Motion Picture Chums (1913-1916), Moving Picture Boys (1913-1922), Movie Boys (1926-1927), Don Sturdy (1925-1935), Tom Swift, Jr. (1954-1971) (technically, ""Victor Appleton II""), Tom Swift (Third Series) (1981-1984) and Tom Swift (Fourth Series) (1991-1993). Contract authors of these books writing under the name ""Victor Appleton"" included James Duncan Lawrence, Howard Roger Garis, John W. Duffield, W. Bert Foster, Debra Doyle with James D. Macdonald, F. Gwynplaine MacIntyre, Robert E. Vardeman, Thomas M. Mitchell.

Tom Swift in the Land of Wonders is the 20th book in the original Tom Swift series. "Every boy possesses some form of inventive genius. Tom Swift is a bright, ingenious boy and his inventions and adventures make the most interesting kind of reading." "These spirited tales convey in a realistic way, the wonderful advances in land and sea locomotion and other successful inventions. Stories like these are impressed upon the memory and their reading is productive only of good." This series of adventure novels starring the genius boy inventor Tom Swift falls into the genre of "invention fiction" or "Edisonade".

Victor Appleton's 'Tom Swift and His Undersea Search; Or, the Treasure on the Floor of the Atlantic' is a thrilling adventure novel that takes readers on an exciting journey into the depths of the ocean. Written in a fast-paced and engaging style, the book captures the imagination of readers with its vivid descriptions of undersea exploration and treasure-hunting expeditions. Set in a time when submarine technology was still in its infancy, the story provides a fascinating glimpse into the early 20th century scientific advancements and exploratory spirit that fueled the era. Appleton's attention to detail and technical knowledge adds authenticity to the narrative, making it an enlightening read for those interested in marine exploration and adventure fiction. The book not only offers entertainment but also serves as a reflection of the cultural and technological landscape of its time. Victor Appleton, a pseudonym used by the Stratemeyer Syndicate, was a collective of authors who wrote popular series books for young readers during the early 20th century. The Tom Swift series, of which this book is a part of, featured the eponymous teenage inventor who embarks on daring adventures and solves mysteries with his innovative inventions. Appleton's background in engineering and science likely inspired the creation of the character and the inclusion of technical details in the story. 'Tom Swift and His Undersea Search' is highly recommended for readers who enjoy adventurous tales, technical marvels, and a glimpse into the historical context of early 20th century America.

Tom Swift and His Undersea Search, Or, The Treasure on the Floor of the Atlantic, is Volume 23 in the original Tom Swift novel series