ago,

The level of technology in many aspects exceeds that of our generation, proficient in architecture and navigation,

There are light nuclear weapons, free-flying vehicles.

as it comes to an end,

The continent of Mu has 64 million inhabitants and many cities,

and has colonies on several other continents,

It is a veritable first empire of prehistoric civilization.

Where Mu's continent sank,

There is a Devil's Sea Triangle in the Devil's Sea,

It is a regional network from Noshimazaki at the southern tip of Chiba Prefecture, Japan, and the 3-point line connecting more than 1,000 kilometers to the east and Guam in the south.

Mysterious disappearances have been frequent since ancient times.

Once ships and aircraft enter the water network here,

Compass failure, radio communication failure or interruption will occur.