1.   As on land, ocean impact explosions excavate huge craters.

2.   They will not excavate a crater, and therefore raise far less dust than surface bursts with the same yield.

3.   Nonetheless, dozens of men continued operating machinery as they excavated a crater at the busy intersection of Neptune and Stillwell Avenues to repair a broken water main.

4.   Instead, they excavated a crater and used plastic explosives to destroy the bomb from afar.