CONTENTS 



INTRODUCTION. .. page 7 



SUMMARY OF DIVES MADE BY BATHYSCAPH TRIESTE 

 (1958-1960). . . 8 



SEA FLOOR STUDIES. . .10 



Water Currents on the Sea Floor. . .10 

 Geology and Biology of the Sea Floor. . J- 1 



ACOUSTIC MEASUREMENTS. . .32 



Sound- Speed Measurements. . .32 

 Sonar Tests. . . 33 



GRAVITY MEASUREMENTS. . . 33 



VISUAL OBSERVATIONS IN MIDWATERS. . .34 



Bioluminescence. . .34 

 Water Clarity. . .41 

 Daylight Penetration. . . 43 

 Marine Biology. . .45 



WATER TEMPERATURES IN THE MARIANAS TRENCH. . .49 



BIOLOGICAL FOULING OF TRIESTE. . .51 



CONCLUSIONS. . .56 



RECOMMENDATIONS. . . 58 



REFERENCES. . .59 



BIBLIOGRAPHY. . . 61 



