Underwater Adventure

Hal and Roger Hunt dive into danger when they join the Oceanographic institute as part of an underwater operation in the South Seas. And it's sink or swim for the intrepid brothers when their aquatic adventures bring them face to face with a foe even more deadly than the sea creatures of the deep . . 

Softcover. English. Knight Books. 1973. 189 pp. In fair/used condition. Book No: 10025989