Tribulation Salvation

The coming 7-year Tribulation will be the most catastrophic time the earth has ever or will ever experience, even worse than Noah’s flood. In Noah’s flood eight people were saved. But Jesus said that unless the time of Tribulation was shortened, “there should no flesh be saved”. The purpose of the 7-year Tribulation is to judge and purge an apostate Israel, and a Christ rejecting world! Yet how does a Jew, or anyone else. obtain salvation during the Tribulation?