Among many other things, the twisting underwater passages in many levels, combined with the air limit, often led to death and frustration.

Total immersion, he soon discovered, was guaranteed by the simple device of making the connection between the first room and the second an underwater passage.

In 2000, two cave divers from California explored underwater passages within the cave.

"All right, show me this underwater passage of yours."

This suggestion later developed into the two towers linked by the underwater passage.

The cave is approached through an underwater passage.

Within it is the entrance to an underwater passage out to the bay that can take 45 breathless seconds to traverse.

He was outside the tunnel, outside the mountain under which the underwater passage had been located.

After an elbow at -35 m the underwater passage continues to depth under steep angle.

But she gave Jack a quick sketch: the risen pyramids, the ambush, the escape through an underwater passage.