I remember seeing some people with these skills on the news a while back. they each had different tricks. one guy made clicking noises with his mouth and heard the echo's back off objects, there was a girl that used echo from her shoes. Crazyyyy...people developing bat skillZ
what's even crazier is that they tested his hearing, thinking maybe since he lost one sense, his sense of hearing greatened so much that he could maybe hear at the frequency of a bat, but no...he hears normal like any other human. i guess he's just more in tune with it. really amazing though.