Danger below!
Series: His A Rick Brant science-adventure story,; 23
Publisher: Grosset & Dunlap
Published: 1968
Place of publication: New York
Language: eng
Number of pages: 178
Subjects: Science fiction.
Description: Two teen-age boys use the technique of helium-oxygen deep-sea diving from a newly designed submersible craft to solve the mystery of a sunken oil-drilling platform.