EXCAVATION OF SUBAQUEOUS ROCKS BY A LARGE BLAST 49 



its energy in breaking rock. Not a single accident marred the 

 enterprise and the office building 300 ft. away from the blast was 

 uninjured. 



The work was carried out by the Massachusetts Contracting Co. 

 of Worcester, Mass., with Mr. O. A. Foster as superintendent in 

 charge, while Lieut. Luther E. Gregory, U. S. N., was the engineer 

 in charge for the government. 



