Since the 1920's scientists have been aware of the strange radio phenomenon known as LDE's (Long Delayed Echoes). LDE's have been studied for decades now and remain a mystery. A great many theories have been advanced over the years to explain these mysteries.

LDE's are radio echoes which return to the sender several seconds after a radio transmission has occurred. Radio waves often bounce off the Moon. However since we know the distance and position of the Moon we can account for these. There are other echoes of anything from 3 seconds to several minutes which remain unexplained. At first it was thought these waves were being reflected back off ionised particles in space.

Later studies showed that LDE's are terrestrial in origin. They all occur in multiples of 138 milliseconds which is the time required to travel around the world. The most popular current theory is that somehow the radio waves are trapped between two ionised layers in the atmosphere and are then guided around the world many times over until they fall out of a gap in the bottom layer...

Could there be an alternative explanation for LDE's? If the Earth is hollow and if it has Polar Holes leading into an inner cavity, would it not seem reasonable to suppose that radio waves might bounce into and out of it? Once inside, the radio waves would bounce around until they lost their energy. Very few would ever escape, but those which do may then be heard as LDE's. Radio waves bouncing into and out of a Hollow Earth would also result in a 138 millisecond travel time. It would also explain why LDE's are so rare. It would also explain their propensity for occurring in the polar regions. Studies have shown that they are more common the closer one is to the polar regions and the lower the level of geomagnetic activity. Furthermore, LDE's are strangely garbled. Could this be because they bounced around the inside of a hollow sphere?

Could it be that the real explanation for LDE's is that the Earth is hollow and that there are Polar Holes?