Son doong Goa - Goa The Whistle
Besides having a very large size, it turns out Goa also has another uniqueness of this cave could spend all day whistling sound no matter how it's night or day. The locals were afraid to approach the cave, let alone get in it. Because of the cave appears strange noises, like whistles which makes hair-raising goose bumps. Belief in the supernatural can sometimes be the great discovery that has been a barrier in sight.
But a team of British researchers from the British Cave Research Association, the work reveals the strange noises that had been feared by residents. According to them a strange whistling wind was coming from a river underground water is very heavy so that the echo sounds strange.
Actually, the British scientist who first discovered this was not the giant cave. Are locals ie, HO-Khanh who discovered it in 1991. He had been told about the discovery, but no one dared to come there because of odd whistles that come from within.