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I watched the documentary about it in ch7 or ch2, they never found that city or it might really exist but just hidden

oo sir, napanuod ko nga din yun, sa ch7 po ata yun. I-witness' Lihim sa Ilalim ng Siudad ni Sandra Aguinaldo. Yun gusto ko siete mahilig sila sa documentary.

thank you so much, I am a big fan of horror stories, I wish someone can do that, it would be awesome :)