Echo chamber

Russell, H.

Echo chamber - 1994 - New Civil Engineer (1071) 27 January 1994, 31-32(2) .

Explains how underground surveying specialist, Geosonde, investigate flooded mines with sonar equipment.


ABANDONED MINE WORKINGS
DISUSED LIMESTONE MINES
FLOODED MINES
GEOSONDE
LASERS
MINE PLANS
MINES
MONITORING
SONAR EQUIPMENT
SONAR SURVEYING