a cave that was built 13,000 years ago

(1)The location is Brazil
(2)Unidentified caves continue to be found
(3)This oyster, which looks like an animal’s gut
(4)You might think it’s a natural phenomenon
(5)It was very different from a natural cave
(6)It’s huge
(7)constant thickness
(8)There’s an intersection in the middle
(9)A number of scratches were found on the wall
(10)It’s because
(11)At that time, 13,000 years ago, the stone tools of mankind were fire
(12)It was possible
(13)And there was no sign of a man like a mural
(14)If you’re not human
(15)Who the hell
(16)gnawing away at the rock
(17)How did you build such a huge cave
(18)He’s the one who found the fossil
(19)He’s got a huge body size of 5 meters tall
(20)Cut off the top with a sharp bar top
(21)It’s a huge cave
(22)It’s a Cosmic Horror
(23)Besides, DNA tests showed that
(24)He’s an ancestor