Can you ride a motorbike across the Tamar, without using a bridge? Watch this video from an upcoming Channel 4 show and find out.

In 'Speed with Guy Martin', motorbike racer Guy attempts to set the world record for riding a motorcycle on the surface of water.

With the help of a Cambridge professor and a team of marine engineers, Guy's stunt hinges on Sir Isaac Newton's Third Law of Motion: that every action has an equal and opposite reaction.

If he can maintain enough speed on his bike, the 250-year-old theory says he should be able to achieve the seemingly impossible: to ride on water.

The team master the engineering on the back wheel and the extra fittings on the bike to enable it to skim across the surface of a lake.

Crashing is inevitable, so Guy endures a rigorous training schedule, trying to escape underwater from a submersion rig and then conducting a series of dizzying trial runs, hitting the water at 30mph head first.

Testing for the stunt took place on the Tamer between Saltash and Plymouth, with the final record attempt taking place at Bala Lake in Snowdonia - which is so deep a 10-storey building could be submerged in it - with Guy surrounded by an army of rescue teams and emergency divers.

Find out if he makes it when the show airs at 8pm on Sunday, January 5.