SHALLOW DRILLING AND EXCAVATING 
SPOIL REMOVAL . 
REMOTE CONTROL SYSTEMS 
CASING THROUGH SEDIMENTS 
Summary . 
Future Plans 
LARGE HOLE PENETRATION OF COMPETENT ROCK . 
Improvement in Methods of Rock Fragmentation 
Novel Drilling Techniques 
Concepts for Rock Fragmentation by High-Frequency 
Vibration . 
Current Activity in Research and Development 
Summary . 
Future Plans 
LARGE HOLE SEALING AND DEWATERING OF 
CAN IIe 
Summary . 
Future Plans 
REFERENCES 
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58 
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75 
75 
Vd 
80 
83 
84 
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88 
90 
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5 
95 
