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conditions apply it's early morning on august the 7th in 1977 on the verdant slopes of the French Pyrenees, not far from

the Spanish border, the sun's first rays are starting to glow. Pale streams of yellow

break through moody storm clouds, lighting up the mountain sides to reveal a blanket of greenery,

scattered with puddles and rocks.

The warmth of the day seems to bring everything on the earth's surface to life.

But hundreds of meters underground, there is a cavernous world where sunlight is a stranger.

Deep beneath the Pyrenees lies an elaborate cave system known as the Goufri de la Pierre Saint-Mattain. Winding for more than 50 miles, its limestone walls

are jagged and angular. Its passageways twist and turn like a coiled snake.

Winds blow through every crevice, water seeps in from neighboring streams, and everywhere

you look, you're greeted by darkness.

Far inside this subterranean labyrinth, 24-year-old caver Dick Willis is climbing.

He's moving slowly upwards, trying to escape an increasingly alarming situation.

Dick's gloved hands, rigid and numb with cold, claw around in the pitch black, tracing indentations on the wet rocks.

His feet slip and slide as he tries to balance his weight.

All around him, underground waterfalls cascade down, pelting in with sharp icy torrents.

Dick's friends, Andy and Paul, are climbing somewhere below him.

The roar of the water makes communication between the trio impossible, and the cave's gloom

...