For thrill-seekers, Dark Cave (Hang Tối) offers an action-packed adventure. The experience typically starts with an exhilarating zipline across the Chay River to the cave entrance. Once inside (with headlamps as there's no artificial lighting), wade and swim through the underground river in darkness.

The highlight for many is reaching the natural mud bath deep within the cave, where the buoyant mud allows you to float effortlessly. Afterwards, kayak back across the river and enjoy water activities like obstacle courses and swimming. Dark Cave Phong Nha provides muddy fun and adventure.