For the record I believe that UFO's and aliens likely exist .... being demons and demonic deceptions. And these may play a part in the satanic End Times deception. But I do not accept in any way a return of the Nephilim to interbreed with humans. In fact, as most know, I do not accept that happened the first time (and please let's not turn this thread into an argument trying to prove that I am wrong on that.) Christ's words that "Just as it was in the days of Noah, so it will be in the days of the Son of Man" (Luke 17:26) refers simply to the fact that people will be going about their normal daily lives with no thought of God until the judgement falls. The evidence that this is the correct interpretation is found in what Jesus said next: "They did eat, they drank, they married wives, they were given in marriage, until the day that Noah entered into the ark, and the flood came, and destroyed them all." (Luke 17:27) Sound hermeneutics would mitigate against a fabulous interpretation referring to Nephilim.
I noticed in one post above that the poster used Daniel 2:43 ("And whereas thou sawest iron mixed with miry clay, they shall mingle themselves with the seed of men: but they shall not cleave one to another, even as iron is not mixed with clay.") to try to support a possible Nephilim prophecy. But, in the context of the entire passage in Daniel 2, it is clear that the wording and the imagery applies to Rome and her future. Employing sound hermeneutics himself, the venerable Bible scholar and expositor John Gill (1697-1771) has the following to say about this verse:
And whereas thou sawest iron mixed with miry clay,.... That is, iron among the clay; otherwise iron and clay will not mix and cement together, as is affirmed in the latter part of the verse; but as some of these toes were of iron, and others of clay, or some part of them were iron, and some part of them of clay,
they shall mingle themselves with the seed of men; the Romans shall mix with people of other and many nations that shall come in among them, and unite in setting up kingdoms; or these kingdoms set up shall intermarry with each other, in order to strengthen their alliances, and support their interests: thus France, Spain, Portugal, and other nations; those of the royal families marry with each other, with such views:
but they shall not cleave one to another, even as iron is not mixed with clay; and yet these ties of marriage and of blood shall not cause them to cleave to and abide by one another; but ambition and worldly interests will engage them to take part with each other's enemies, or to go to war with one another, to the weakening and hurting each other; and thus the potsherds of the earth will dash one another to pieces; and those who are more powerful, like the iron, will trample the weaker like miry clay under their feet.
This interpretation is born out by the vast majority of the greatest expositors of Church history. The Geneva Bible in its study notes gives the heart of the meaning very succinctly:
"And whereas thou sawest iron mixed with miry clay, they shall mingle themselves with the seed of men: but they shall not cleave one to another, even as iron is not mixed with clay. They will by marriages and affinities think to make themselves strong: yet they will never be united in heart."I pray this helps.