There are angels chained at Euphrates River that will one day be loosed during the Great Tribulation

The receding waters of the Euphrates River have revealed many ancient archeological sites. Just recently, mysterious caves also have been found. The caves are so mysterious that origin is still unknown. People still investigate whether the caves were dug by human or by demons. 

​It is impossible to say the caves were formed by itself. Some people suggest the caves were prisons. They probably were used to jail demons. Since Euphrates River have run dry and the demons have been released as mention in the bible. That is why this discovery is often connected to Revelation 9:14. Release the four angels who are bound at the great river Euphrates.