Russian soldiers race to build pontoon bridge over Yenisei

This impressive footage shows Russian troops building a 1500 ft pontoon bridge seemingly in less than a day. 

A video posted on social media by military experts RussianDefence.com shows hundreds of troops assembling the temporary structure over the Yenisei River.

The clip shows the men connecting three REM-500 trestle frames together, working on individual sections dressed in high visibility jackets and camouflage suits.

The astonishing temporary structure is made from three trestle frames (pictured), which are connected by hundreds of men 

It is not clear exactly how long it takes to build, but the lack of nightfall in the video implies it was completed over the course of a day 

It is not clear exactly how long the bridge takes to build, but the lack of dark skies in the video imply it was completed over the course of a day. 

The River Yenisei is the largest river system that flows to the Arctic Ocean, from Mongolia up through Siberia to the icy sea to the north. 

Helicopters are seen flying overhead as the impressive structure comes together for the military exercise.

Soldiers run in formation across the decks as others emerge from the river in scuba diving costumes.

When the bridge is complete a large steam train goes across it followed by a convoy of military vehicles.

The troops stand to attention at the sidelines as they admire the fruits of their labour. 

When completed the floating bridge is used to accommodate a steam train (pictured) followed by a convoy of military vehicles 

As helicopters fly overhead, the soldiers stand to attention on each side of the train passing over the bridge, admiring the fruits of their labour 

The soldiers are dressed in camouflage uniforms, carrying guns and wearing green berets