Atomic War

(Rev 6:12-14) I looked when He opened the sixth seal, and behold, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became like blood. {13} And the stars of heaven fell to the earth, as a fig tree drops its late figs when it is shaken by a mighty wind. {14} Then the sky receded as a scroll when it is rolled up, and every mountain and island was moved out of its place.

Men of all classes would seek shelter during such an assault.

(Rev 6:15-16) And the kings of the earth, the great men, the rich men, the commanders, the mighty men, every slave and every free man, hid themselves in the caves and in the rocks of the mountains, {16} and said to the mountains and rocks, "Fall on us and hide us from the face of Him who sits on the throne and from the wrath of the Lamb!

This is the limited, battlefield nuclear war between Israel and Russia. Both of these countries are capable of carrying this out. There has been speculation that the earthquake mentioned may trigger the nuclear exchange.

(Rev 8:1) When He opened the seventh seal, there was silence in heaven for about half an hour.

This half hour period has come under much speculation, but it could be the limited nuclear exchange escalating into a world wide exchange. It takes approximately 1/2 hour for intercontinental ballistic missiles to launch, go through the earth's atmosphere into outer space, and re-enter the atmosphere to hit its target. Every person on the earth will have this amount of time to go to the safest place and wait for the bombs to fall. Some people will no doubt have bomb shelters to enter. These are the dens and the rocks of the mountains referred to above.