Hello and welcome to live coverage of the big one: it's double Stelvio day on the Giro d'Italia with the 222km queen stage 16 from Rovetta to Bormio - one that also includes the fearsome Mortirolo. Sit tight, buckle up, and join us for the ride...

OH NO! Tom Dumoulin stops on the side of the road, tears his jersey off, rips down his bib shorts - and yes, does what you think he does! Luckily the camera pans away, but he's having a stinker out there...

They're onto the small rise to Santa Maria Val Mustair ahead of the Umbrailpass proper. WIth the gap going down to 1:40 this break has fractured. Kruijswijk and Landa have ridden clear, with Amador and Hirt in pursuit. Further back we have Anacona and Anton.

Over the border they go - and we're now officially in Switzerland. It's the first time the Giro100 has left Italian soil - and we have a break of six riders carrying a lead of two minutes ahead of the final climb. They are: Mikel Landa (Team Sky), Winner Anacona and Andrey Amador (Movistar), Jan Hirt (CCC Sprandi Polkowice), Steven Kruijswijk (LottoNL-Jumbo) and Igor Anton (Dimension Data).

Cataldo comes to the front and remonstrates with Plaza, who is driving an infernal pace. He gesticulates wildly, something along the lines of "What the hell are you doing?" but the Spaniard flicks a wrist and shouts back, along the lines of "Mind you own business, wise guy".

The gap is coming down quite quickly under the pace-setting of Orica-Scott and Katusha-Alpecin back in the pack. Amador is no longer in fourth place in the virtual standings, dropping to fifth as the gap comes down to 2:15. It's worth remembering that they've already been racing for more than five hours - and we have another hour at least, probably a bit more, say 13 minutes more. I reckon a finish at around 17:00 CET.

Deignan is done for the day: the Irishman hits the wall - just as Kiryienka did earlier. So Landa has burned all his matches and now must do it alone. The road is still rising as the riders approach the Swiss border. The main pack has returned to within 2:35 of the six leaders.

Orica-Scott have Ruben Plaza on the front of the main pack now, with Adam Yates a bit further back in the group. There are loads of pairs out there: Cataldo and Sanchez are there for Astana, while Bahrain Merida have Nibali and Pellizotti. Movistar are taking a breather - probably because Dumoulin is off the back with his Sunweb team car. The calm before the storm. Katusha-Alpecin send one of their riders to the front to help lead the chase for their man Ilnur Zakarin, whose position is under threat from both Amador and Kruijswijk in the lead group, which has 3:10 to play with.

There's no flurry from the break for the intermediate sprint - despite six bonus seconds being up for grabs. It's the Sky duo who go over ahead of Anton and the others.

Laurens ten Dam is back with the main field and riding alongside his Sunweb leader, Tom Dumoulin, the man in pink who, so far today, has passed this test with flying colours. Meanwhile, Amador and Landa are back with the other five leaders, so we have seven out ahead - and the gap is 3:07. Deignan and Landa for Sky, Anacona and Amador for Movistar, Hirt for CCC, Kruijswijk for LottoNL-Jumbo and Anton for Dimension-Data.

It's fair to say that the scenery around these parts is pretty spectacular...

Pierre Rolland has been caught by the main pack. The Frenchman has never been a renowned descender and so that's no huge surprise. Most of the riders are taking off their jackets ahead of the final climb. Gorka Izaguirre, who was with the leading group, is now back with the main pack and alongside his team-mate Quintana.

The two leaders have 35 seconds on the chasers and 2:45 over the maglia rosa group. So as it stands, Amador is up to fourth place on GC and above Nibali in the virtual standings.

Amador reaches to his back pocket and liberates a gel. He and Landa have reached the bottom of the descent and will soon start the false flat ahead of the second intermediate sprint. There are then two little peaks before the final climb, the Umbrailpass, which itself is followed by a long 20km descent to Bormio.

Kruijswijk, Anacona, Hirt, Anton and Deignan are in a five-man chase group behind leaders Amador and Landa. They still have round 2:30 over the main pack and around 25 seconds on the chasers.

Landa has dropped Kruijsijk and now caught Amador on this descent. Earlier we saw the Movistar man skid a little on one of the tight bends, so perhaps he's taken his foot off the gas a little.

Kruijswijk leads the chase ahead of Landa. The Rolland group is at 1:38 and the main pack at 2:10. This is a hair-raising descent, to be fair.

Rui Costa is about to be caught by the main field, which is being led by Bob Jungels and Carlos Verona of Quick-Step Floors. Because of the multitude of bends, it's hard to get up a lot of speed on this descent. But Amador is doing his best effort - the Costa Rican has opened up a little gap over the other leaders, who have already caught Landa on the descent.

Rolland, ten Dam and Foliforov ride in a three-man chase group 1:30 behind the nine leaders as they edge down the first of these 48 hairpin bends extremely gingerly. That's primarily because they're very steep and tight, but also because the road surface is pretty shocking - all cracked and potholed from the freezing water and melting snow.

Here's the moment Landa won the Cima Coppi.

Mikel Landa crests the summit to take the Cima Coppi prize at the top of the Passo dello Stelvio.

Igor Anton and Mikel Landa - former Euskaltel team-mates a long time ago - open up a small gap near the summit. It's the Team Sky rider, who is wearing a jacket and gilet, who jumps clear in pursuit of the KOM points. Anton can't keep up with him, while Sanchez is a bit further back and ahead of the other escapees.