On the salty lake of Utah, we are used to seeing strange machines, laid a few centimetres from the ground, thrown at speeds that we don't even imagine on a motorway. This summer, it's a well-known name of the construction sites that will land in Bonneville: JCB, the specialist of excavators and BTP machines, returns with a fuseled machine powered by hydrogen. Displayed objective: to record its name once again in the history of the records, but w…