Echolocation by piledriver

There are two great big honking machines on the site of the new hospital hammering big long concrete pilings into the ground. You can almost do the bat thing and practically navigate the construction site with your eyes closed just by listening for the echoes from the pile driving. With a little bit of concentration, I can just about make a mental map of the surrounding buildings just by the echoes. Of course knowing where the surrouding buildings are helps a bit too.

When they're both going at the same time, they make quite the racket. And from the looks of all the big long trucks delivering pilings, it's going to be going on for quite some time.