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Proceedings Paper

The Sea Change - 300 Fathoms Deep, 3 Years Later
Author(s): James F. Selvidio
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Paper Abstract

The sea change experienced in a large under-water acoustic energy source, placed on the ocean floor at a 300-fathom depth, is discussed as it is examined from the surface three years later by reactivation of an installed closed-circuit video link. The author recapitulates an earlier paper on this subject that was presented at the SPIE Seminar of February 1968 (published in the Seminar Proceedings, vol. 12, pp. 73-80), updates the background of the initial ocean emplacement, and discusses the sea changes in the submerged structure and instrumentation. He illustrates the various areas of interest by videotape recordings. Many questions have arisen concerning the effects of long-term deep submergence on various parts of the video' apparatus including the camera, camera viewport, the camera pan and tilt unit, the lighting unit, and the long cable. This paper discusses some of these questions.

Paper Details

Date Published: 1 June 1971
PDF: 8 pages
Proc. SPIE 0024, Underwater Photo-Optical Instrumentation Applications III, (1 June 1971); doi: 10.1117/12.953477
Show Author Affiliations
James F. Selvidio, Naval Underwater Systems Center (United States)


Published in SPIE Proceedings Vol. 0024:
Underwater Photo-Optical Instrumentation Applications III
Seibert Quimby Duntley; Joe J. Lones; H. S. Weisbrod, Editor(s)

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