[DRAMATIC MUSIC PLAYING] JANNE:Here we have the biggest ski jump in the world. Oh, me? Oh, yeah.

I think I'm more nervous than you are. JANNE:There are so many challenges to smash this world record. But the first challenge is, that there is no ski jump big enough in the world, so we need to build our own.

We needed the real expert to build it. BERNIE:We first had to figure out exactly what we needed to make this jump work. We have 34 degrees and 250m.

We had to find the right slope, angle and length, the conditions, air pressure. So, after all the calculations and modeling, we searched all over the world for the perfect hill to build this jump. This angle looks good for me.

20 meters. BERNIE:We have to move slow as much as possible, day and night, 24 hours. The weather is quite rough.

This is not what we need. You know, of course, I'm worried about that. The other day we had a nice sunshine, almost zero wind.

And I would like to see one of those days in the next week. I've been working here for over half a year now. BERNIE:We moved more than 120,000 cubic meters of snow, preparing the run to be just like the standard ski jump, only much bigger, and out here, right up the mountain.

-Happy? -Yeah. Then I'm happy.

BERNIE:We have calculated the speed needed. 105. BERNIE:But the only person who can tell us if it's really right is Ryoyu.

JANNE:It's a longest ski jump ever. So huge, so big. Just coming down is an achievement for sure.

It's been Ryoyu's dream for a long time. This is his day. BERNIE:So, here we have the biggest ski jump in the world.

Ski jumping world record is 253. 5m. Let's see if Ryoyu can smash that today.

JANNE: Starting from the gate, because this is the first hill size like this. We don't really know where we should set up the gate. Ryoyu will come to the table with a speed around 105 to 107km/h.

He will take off, launching himself and flying through the air around 9 to 10 seconds. Actually the wind is the only thing that can destroy this. Because the speed is so fast, and he's staying in the air so long, the weather and the wind conditions are extremely important.

Still too much wind per Janne. I'll be standing there and waving down with the flag when it's safe to go. With the wind as current now, we should not jump.

Out, out, out. Take him off the bar, off the bar. Too much wind.

I will not let him down when it's, you know, if there is anything wrong with the conditions. That's my job. That's my responsibility.

-This breeze will like suck him down. -Yeah. Also more longer he will wait, more stress it is.

Yes. Okay. It's getting better.

It's getting better. JANNE:Yeah. Let him jump.

You can send him. Okay, go up. MAN 2:Ryoyu going on the gate.

Ryoyu going on the gate. Now it's really good. MAN 2:Looks like it's getting better now.

I think we should be ready. . .

JANNE:Okay. Get ready. MAN 1:Okay.

Get ready. JANNE: Not totally, but almost calmly. So now this supposed to be much better chances to fly.

JANNE:Ryoyu is ready? Ready. Three.

Two. One. Go!