A very fine YA/"juvenile" from 1954, reminiscent of the works of, say, Robert A. Heinlein or Lester Del Rey. The first-person narrative is fast-moving and adventuresome, with many cute cliffhangers that are not cheesy or overdone. I was struck by how beautifully evocative the novel is--the colors, the naval traditions, the descriptions of the mysteries of the deep. In retrospect, it is particularly interesting that, unless I missed it, space travel simply does not seem to be mentioned at all; the excitement, the glamour, the romance instead all exist beneath the waves.