Just last year they discovered underwater walls and ruins just north of Manila...
Judging from it's form and materials, the underwater ruined megacity looks like it's a contemporary of the The Liangzhu Culture and is influenced by the Liangzhu culture.
Likewise, jade excavated in the surroundings date to 2200 B.C.
If these discoveries are authenticated and put into the books, it would mean that we aren't isolated tribes at all and then like our neighbor Vietnam, we have a civilization that stretched into the B.C. era.
