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Concrete, compressive strength, undersea, pore pressure, triaxial loading, hydrostatic loading, saturation, deep ocean structures. 20 ABSTRACT (Continue on reverse side H necessary er,d identify by block number)Freshly mixed concrete, of low-and high-strength mix designs, was placed in the Pacific Ocean in 6 x 12-inch (152 x 305-mm) cylindrical molds to attain initial and final set and cure at a depth of 1,830 feet (560 m). At age 11 months, the concrete specimens were retrieved and subsequently tested under uniaxial compression in a pressure vessel that simulated the ocean depth. The compressive strengths of the deep-ocean concrete specimens (continued) DD , jAN^a 1473 "1 NOV 65 IS OBSOLETE Unclassified SECURITY CLASSIFICATION OF THIS PAGE (When Dele En MBL/WHOI D3D1 0DMDE24 M Unclassified SECURITY CLASSIFICATION OF THIS PAGEfH-han D»(o Enfored; 20. Continued were compared with those of controlled concrete specimens cured in a fog room and also in a tank containing continuously circulating seawater.