Nightmare Sinkhole

Strange sinkhole in Quang Binh named Nightmare, so far less than 10 people have 'touched' the bottom

VietNamNet

20/03/2025

What's in the sinkhole called Nightmare in Phong Nha - Ke Bang National Park?

Báo Sức khỏe Đời sống

11/03/2025

Experience ziplining across the Nightmare sinkhole with a mysterious underground river inside

Báo Dân trí

06/03/2025