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A rescue worker steps carefully along the rim of the Poo-O-O crater in Hawaii Volcano's National Park.

Cold rain stings his face as he gets pummeled by the howling wind.

Above him, the sky boils with a mass of storm clouds that are growing darker as sunset approaches.

The path along the rim is wide enough for several men, but it still feels like walking a tightrope.

The rescue worker struggles to keep his balance as loose volcanic rocks give way under his feet.

Poo-O-O is the most active crater in the Kilauea volcanic system.

The rescue worker stops for a moment to peer into it. All he can see is a swirling mass of thick volcanic steam and gases filling the crater like a cauldron.

Hello! Can anyone hear me?

There's no reply. A few hours earlier, a helicopter carrying two Hollywood cameraman and their pilot crashed inside the crater.

The pilot was rescued by another chopper, but then a violent tropical storm rolled in, stirring up high winds and trapping dangerous volcanic gases inside the crater.

The leaders of the rescue operation refused to allow another flight in such dangerous conditions.

Now, a team of rescue workers scouts along the rim of the crater, shouting down to the two lost men, hidden hundreds of feet below in the toxic fog.

Can you hear me? We're with the rescue team. Hello!

Nobody answers. Even if the men happen to be right below him, he'd be surprised if they could hear him over the roaring winds or if he could hear their reply.

Through the gloom, a figure approaches. It's his supervisor.

That's it. We have to call it...

All afternoon, they've battled the storm, but now the intensity has reached a new level. The rain is literally blowing sideways, and violent gusts of wind are threatening to knock the rescuers off the rim and into the crater.

The rescue worker knows it's dangerous. The volcanic rocks are razor sharp. One loose stone could start a rock slide that would cascade down onto the men trapped somewhere below. Still, he's not ready to give up.

But we can't just leave them down there. I know, but with this wind, we're likely to join them if we don't head back down to base camp, and the sun's about to set. We won't even have visuals. We're close. I can feel it. Give me 20 more minutes. Just...

I suddenly gust of wind knocks the rescuers off the rim. He stumbles, falls forward, and lands face down on the sharp rocks, just inches from the crater's edge. He looks down to the thick volcanic haze. Behind the veil of steam, the rescuers know there's a steep drop hundreds of feet down to the rocks below. The supervisor rushes to help them up.

Hang on! I got you! The rescue worker catches his breath. You're right. We should get out before someone gets hurt. I just hope those guys can make it through the night. His supervisor's size.

...