Because it goes a thousand miles an hour, that's why.
This is obviously a bit different from the videos Chris Harris and his excellent YouTube channel usually produce, and indeed it is one of the longer ones as well. But that's because the Bloodhound SSC is such a unique vehicle, and the kinds of speeds that it's capable of are somewhat difficult to wrap your mind around. To give Mr. Harris any sort of sensation of what it's like to drive a car like this, the Bloodhound folks actually need to take him up in a plane.
The whole thing is just incredible, so just settle in and prepare to have your mind blown.