[Kleeyook]

ch 184 is up on Chinese site.

Spoiler for My theory:

I believe that this is just the end of part 1, with part 2 to follow, since I don't think it'd be possible to wrap the whole thing done with decent conclusion in ONE last chapter. The series still remains popular too. Maybe it'd be like Shounen EX, where they discovered that the apocalypse happened to devastate the whole world (and virus) and they're one of a few surviving humans, hence possibility for part 2 where they'll travel to the mainland.

From the look of Akira's mom who became really old grandma when the creation of the island finished (hence the old guy Mitsurugi said he couldn't make Miina's dream comes true without someone to succeed his will, since it'd take 40-50 years to make the project reality) and how the equipments in the island are very old (30-40 years old since they were abandoned), I believe that Akira's group has time-traveled at least 70 years in the future (or maybe 100 years in the future).

My theory is that somehow human civilization is already wiped out. Considering that the project on the island doesn't seem to be a secret project at all. Even if the accident happened and the researchers there died, there would be many people coming to the island for many purposes (like the research data, the sample of species created there etc.) and tried to colonize the island for themselves. I think it's possible that somehow there was a virus outbreak all around the world (probably due to the research on this island) that wiped mankind out thus no one came to search.

Or maybe due to some international policy the whole world decided not to have anything to do with this island, covered the incident up, abandoned and forgot about it (although there should be a plane flying pass the sky near the island considering that the air traffic there should be busy and Akira's plane used to use that line).