Mais um livro da autora Ruth Brindze, em seu original na língua inglesa, sobre a atividade de mergulho sobre exploração submarina, raro.

An Allabout book by Ruth Brindze. Published in 1960.
Hardcover, 145 pages and filled with vintage early 1960s photos. 
Fascinating underwater account for kids. Contents are: The World Beneath the Sea;  Fathoming the Oceans Secrets; Scientists at Sea; Helmet and Scuba Diving; Descent by Bathysphere; Bathyscaphe Exploration by Submarine; Treasure Hunters on the Bottom; Underwater Photography; The Search For Oil Beneath the Sea; Wiring the Oceans Earth`s Last Frontier. 

Of the dust jacket images, I presume one is British, the other USA, but not sure which is which.