Publicado por Grosset and Dunlap, New York, 1956
Librería: Granny Artemis Antiquarian Books, Bremerton, WA, Estados Unidos de America
Original o primera edición
Hardcover. Condición: Very Good. Dust jacket included. New York: Grosset and Dunlap, 1956. First Edition. Very Good hardcover in edge-chipped dustwrapper with one inch piece gone from the top of the spine panel. Christmas gift inscription dated 1956 on first title page. Pictorial endpapers, and frontispiece by Graham Kaye depicting the saucer-like underwater helicopter the "Ocean Arrow" at the bottom of the ocean. Book #7 in the Tom Swift Jr science fiction series.