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Difficulty in satisfying increased requirements for aeronautical communication channels appears to justify investigating the potentialities of various means of submarine cable communication as a means of easing the burden on long radio links. Relief might be found by using submarine cables to connect strategic and widely separated land stations and thus materially reduce the length of radio links required. As a first step in this direction, the paper discusses the capabilities of conventional types of cable now in use for telegraph, voice and carrier frequency transmission. Submerged repeaters are now being used for increasing the range of telegraph and telephone cables, and the fundamental principles involved in their design and installation are described.