TABLE OF CONTENTS 



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ABSTRACT 1 



INTRODUCTION 1 



BACKGROUND 2 



DESCRIPTION OF ALVIN PRESSURE HULL 9 



MEASUREMENTS OF INITIAL IMPERFECTIONS l3 



RESULTS OF MEASUREMENTS 20 



DISCUSSION 27 



SUMMARY AND CONCLUSIONS 36 



ACKNOWLEDGMENTS 36 



REFERENCES 37 



LIST OF TABLES 



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Table 1 - Local Geometry of the Three ALVIN Pressure Hulls 31 



Table 2 - Critical Local Geometry and Calculated Collapse Depths 



for the Three ALVIN Pressure Hidls 33 



