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The conclusions of the investigation are: (1) The dielectric, thermal and mechanical properties of the Kapton insulation are admirably suited to serve the unique needs of the short time duration underwater service. (2) The single-strand solid conductor provides considerably more favorable heat transfer through the insulation to the sea water than the equivalent cross section seven strand conductor. (3) A satisfactory solution to the dereeling problem requires innovations in the payout equipment and cannot be solved by conductor modifications alone. A tapered arbor held at the center of the coil has been very effective in eliminating kinking during the dereeling. (4) The reliability evaluation has given encouraging indices. More extensive and carefully designed tests are needed to establish a true criteria. (5) The polyimide, FEP Teflon sealed tape insulation system, is the best that has been tested and it promises to meet the present requirements of the application. (Author), Presented at the Annual Wire and Cable Symposium (15th), Atlantic City, N. J., 7-9 Dec 1966. Prepared in cooperation with General Electric Co., Lowell, Mass., Wire and Cable Dept.