Snowpiercer Season 3 has been a wild ride for the remainder of humanity as they take on a path that relies on the vision of one person who took hints from signs as if he is the messiah to save all from a lifelong journey and start a new civilization on land after the whole world gets frozen in arctic tundra. Episode 7 has a lot in store and here is the ending explained.
Warning! This article contains spoilers for Snowpiercer! Read at your own risk!
Snowpiercer Season 3 Episode 7 Ending Explained

In Snowpiercer Season 3 Episode 7, Ouroboros, the episodes have been jumping in and out of Layton's dream as he got into a coma after surviving death after the fight with Pike. Layton gets uncanny visions from people in real life playing a different role in his dreams.
From his dreams, he realized that the tree that he has been seeing in his visions is from a photo he saw at the arc reactor where he saved Asha from and after discovering that the said tree only grows in the Arabian region which is the last spot on Earth that they haven't checked in Melanie's research, Layton took a hint on these signs.
Layton takes the fate of the whole train there, considering himself as a messiah of what remains of humanity. It's an ultimate leap of fate to have such a decision and whatever happens, Layton is sticking to it, but as Ruth and Bess have warned him before, it may or may not be real, and if not, he has to understand the consequences of his actions.
Related: Snowpiercer Season 3: Pike Comes Back to Haunt Layton
Meanwhile, Wilford is back on his feet and he remains obsessed in looking for something that he asked Alex for maps and equipment as he remembered something. Wilford tells Alex that while they were away on the pirate train, they received a signal from Marseille, France. Alex clarified that the pirate train never passed that region and Wilford conclude that the signal could be from Melanie, the only one who could send a signal like that.
It seems that there is a hint that Melanie may still be alive because Wilford knew that she is the only one capable to send such a signal aside from the trains, of course, and with the pirate train not passing through that region, it could only be Melanie.
However, questions arise as to how Melanie got to France and how she survived the cold for the whole period of time when the pirate train and Snowpiercer were separated. That was half a year. That is, unless, Melanie got some sort of transportation or there are other survivors out there.
Snowpiercer Season 3 Episode 7 is now streaming on the TNT app and website.
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