Now we have to visualize who the fortunate ones would be, who could board various ships which would leave in HASTE from various ports all over the world, in case sea water rises significantly (the rise of sea water would be such that it could cover almost the entire land mass leaving only top of some high mountains). Obviously people who could manage the ships and the persons who are close to the power set up, would be able to board these ships. The persons close to the power set up would be powerful politicians, bureaucrats, influential religious leaders and businessmen. No saints, who by definition are persons who had renounced everything, would be a part of this.
As such hundreds of their generation would be living, on board, anchoring at times at the hill tops, only to move away back to sea, as these hill tops were witnessing looting and arson of the worst kind as there were hardly any resources left for survival. There was no food available on land. The only food was the sea food and that too in the area where the Indian sub continent existed. It is in this context MATSYA AVATAR makes sense. Some of the ships were now owned by persons who had become human flesh eaters. They were called RAKSHAS. You can also read: MATSYA AVTAR IN LIGHT OF GEOGRAPHICAL CONDITIONS .
Let us now move further. Now the churning of ocean or wave movement has once again started. Slowly they can see the increase in land mass. They decided to end their journey over sea, since now the land mass was more, they could possibly defend themselves. It must be remembered that during their long painful journey of hundreds of generation they were told again and again that there will be once again large habitable land to live on and enjoy. Most of them did not believe this; yet they were told again and again only to motivate them that this was truth or Satya. So when they ended their journey they realized that what they were told was truth or Satya, and as such the yug is called SATYA YUG.
Regarding evolved humans, known as Vaanars, there exploitation was severe and both from Kingdoms (or Aryans) and Rakshas. The exploitation was so severe that the future avatar of Parashuram could not arrest that. Shri Ram ended this exploitation.