There were survivors in the flood, and an innumerable number survive the tribulation as well sir Rev 7:9,14
There will be survivors from this age when the Lord comes again. They will be all of the elect the angels will gather together from the four winds of the earth, and heaven when they see the Son of man coming in the clouds of heaven with power and great glory. They will be the innumerable multitude John sees in heaven of all the Jews of faith and all who are saved from Gentile nations. It is in this age there shall be "great tribulation" to come out of. Every believer possesses eternal life through His Spirit in them. So, all believers come out of "great tribulation" of this earth. There will be no more tribulation (great or not) in the age to come.
Matthew 24:31 (KJV) And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Flesh and blood cannot inherit the heavenly Kingdom Rw, like Jesus they will be resurrected as a spirit being.
(1 Corinthians 15:44, 45) 44 It is sown a physical body; it is raised up a spiritual body. If there is a physical body, there is also a spiritual one. 45 So it is written: “The first man Adam became a living person.” The last Adam became a life-giving spirit.
The body that shall be in heaven after our physical body dies, is not flesh and blood, but is as the angels in heaven, a spiritual body. Bob, why won't you believe Paul? When our body of flesh and blood dies, it dies a physical body. But through the life-giving Spirit of God in every believer, our spirit (breath, mind, mental disposition, rational soul) leaves our physical body of flesh and blood as a spiritual body, like the angels, to be with the Lord in heaven. Christ, knowing death could not separate us from Him, before leaving this earth tells us we will be with Him, where He is, whether on the new earth or in heaven. In heaven we shall be with Him as spiritual body, and in the age to come on the new earth as immortal, incorruptible humans, as we were in the beginning when God created man.
John 14:2-3 (KJV) In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Death cannot keep us from being with the Lord in heaven after our physical body lays dead and returns to the dust of the earth. That's why Christ says we should not fear those who can kill our body, because they cannot kill our living (spirit) soul.
Matthew 10:28 (KJV) And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.
Just as the last Adam, Jesus Christ became a life-giving Spirit, so too we become spiritual body in heaven. In this life we bear the image of the first Adam who is of the earth, flesh and blood. But when we become spiritual body, we will bear the image (spirit/soul) as they that are in heaven, or heavenly bodies.
1 Corinthians 15:47-48 (KJV) The first man is of the earth, earthy: the second man is the Lord from heaven. As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly.
Unlike Christ, when our physical body dies it returns to the earth from which it came. The physical body of Christ did not decay, even though Christ too was fully human and fully God. His physical body when resurrected from death is immortal. Human flesh and blood cannot be immortal because every human body of flesh and blood is mortal, meaning destined to die. Which is how we can understand how the Son of God is Divine. That's why when we die the only part still living of us, through the Holy Spirit in us, is our spirit/soul which is what gives our mortal body the breath of life, a mind, will, emotions. Until our bodies are resurrected to immortality and incorruptible, they are not fit to have physical life again from our eternal spirit on the new earth, until they are resurrected to immortality and incorruption. Because in the age to come, on the new earth, they will be no more dying, and no more corruption.
1 Corinthians 15:49-50 (KJV) And as we have borne the image of the earthy, we shall also bear the image of the heavenly. Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.