Not as the airplane is master of the heights, is the submarine master of the depths. The lowest which a U. S. submarine has ever gone is 315 feet below surfaceand that only by accident.* Last week off Portsmouth, N. H., Lieutenant Commander George A. Rood took the new V-2 down to 220 feet. To get there it took three different plungesfirst to a depth of 50 feet, then a shifting of ballast, a plunge to 110 feet, another ballast-adjustment, and then a final plunge to 220 feet, at which level the underwater...
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