BBC's Race Across The World unveils major surprising shake-up just hours ahead of the final leaving fans stunned

Race Across The World fans will be treated to an exciting twist as the series' final looms.

Four remaining couples will be battling it all out to win the £20,000 prize on Wednesday's episode, after racing across eastern Asia.

Four pairs now remain, including friends Alfie and Owen, siblings Betty and James, Eugenie and her daughter Isabel, and couple Stephen and Viv.

And viewers of the series have been raving when, just mere hours from the final, it was announced that they will be given a look behind-the-scenes look of the show.

The special episode will be available after the final, and it was teased it could also be a reunion for the contestants.

Race Across The World fans will be treated to an exciting twist as the series' final looms (finalists pictured on This Morning on Tuesday)

Race Across The World fans will be treated to an exciting twist as the series' final looms (finalists pictured on This Morning on Tuesday)

Four pairs now remain, including friends Alfie and Owen, siblings Betty and James (pictured) Eugenie and her daughter Isabel, and couple Stephen and Viv

Four pairs now remain, including friends Alfie and Owen, siblings Betty and James (pictured) Eugenie and her daughter Isabel, and couple Stephen and Viv

The show's official Instagram page wrote alongside a teaser clip: 'For the first time ever, we're showing you how the race comes to life!

'See what happens behind the scenes in the #RaceAcrossTheWorld reunion, Wednesday at 10pm on BBC iPlayer, straight after the grand finale!'

Viewers couldn't contain their excitement and flooded the recent post with thrilling comments ahead of the eagerly-anticipated final.

'I love this show and have always wanted to know what happens in the background with cameras, producers etc. 

'For example, do participants have to account for the crew when they're booking bus tickets, boats and taxis? Do the crew see that bags/maps have been left behind but can't say anything? It's such a well made show. Can't wait to watch it,' said one person.

'I genuinely love this show, however all the participants should be able to complete the race and no one should leave'; 'Favourite programme and fabulous to see behind the scenes'; 'Brilliant!! Interested to see it'.

Creators of hit BBC series Race Across The World have told how producers and contestants alike face ever-present danger from civil war, natural disasters and local unrest as they travel through some of the globe's remotest regions.

The show may have inspired wanderlust among millions of viewers, but for those behind the camera, it is one of the most difficult and dangerous jobs in TV.

Its fourth series, which has seen contestants travel from Sapporo, Japan to Lombok, Indonesia, is set to climax this week as the pairs compete to win a life-changing £20,000.

Four remaining couples will be battling it all out to win the £20,000 prize on Wednesday's episode, after racing across eastern Asia

Four remaining couples will be battling it all out to win the £20,000 prize on Wednesday's episode, after racing across eastern Asia 

And viewers of the series have been raving when, just mere hours from the final, it was announced that they will be given a look behind-the-scenes look of the show

And viewers of the series have been raving when, just mere hours from the final, it was announced that they will be given a look behind-the-scenes look of the show

But the eight episodes and 9,300-mile journey has been beset with problems from the start - with dry runs of the route by producers being impeded by geopolitical issues, the threat of volcanoes and protesters.

Previous series have even seen repeated thefts of camera equipment and producers left stranded at sea for days on end.

For its fourth series, all contestants had to be flown from South Korea to Vietnam during the route due to travel through China being deemed too risky.

Previous series proved that producers cannot be too careful: the second series saw civil unrest break out in Chile, forcing the evacuation of one pair to Argentina.

During filming for series two, the contestants had to race to travel through Bolivia within three days in order to avoid becoming trapped in the country during tense elections.

And in Ecuador, an advance production crew landed to find an approaching uprising, with protesters surrounding the airport, forcing another hasty evacuation.

For this series, the threats were more natural with volcanic activity in both Japan and Indonesia.

Executive producer Stephen Day described how teams are sent out to test the routes beforehand. 

He said: 'People sign up to the recce thinking that it's going to be one of the most fun jobs in telly but I think it falls a little short of that.'

The teams have to survive on the same amount of money and navigational information as the contestants - and often come across problems.

One such incidence saw a producer stranded at sea for three days on a dry run, and then a further five days during the actual show. 

The show's bosses have to carefully consider which producer to pair with each team due to the stress of the experience, and the fact they will be spending around 50 days together by the end of the series.

Staff accompanying each time - usually a producer and camera operator - also have the added responsibility of ensuring all their equipment is charged, operational and protected, meaning they often get less sleep than the racers themselves.

As well as the time pressure of the journey, and struggle to live frugally, emotions can often run high.

For this series, threats were more natural with volcanic activity in both Japan and Indonesia (pictured Alfie and Owen)

For this series, threats were more natural with volcanic activity in both Japan and Indonesia (pictured Alfie and Owen)