Almost all excavation will be from drained sections of the upper Hou Sahong , though blasting would still occur very near the dolphins behind a coffer dam .
The construction plan for the Don Sahong Project excludes underwater blasting downstream of the dam site .
Almost all excavation will be from drained sections of the upper Don Sahong Project   , though blasting would still occur very near the dolphins behind a coffer dam .
The construction plan for the Don Sahong Project excludes underwater blasting downstream of the dam site .