Remember Bas Keep and his video from last year in which the BMX stunt rode down walls in Brighton and Croydon?

> Video: Amazing skills as BMX ace Bas Keep rides down walls

Well, he’s back with another video, and in this one takes to a tunnel beneath a reservoir with some pals to do a bit of riding.

Getting down there was an achievement in itself, and could only be done when the water level in the reservoir was low, with access gained via ladder from what Keep described as a “plughole” – basically, the reservoir’s overflow system.

Once down there, there were some top skills on show as well as cups of tea being passed around (in proper cups, too) – although as Keep points out, if someone had a crash and for example broke a leg, there’s no way out.

As he says in the description to the video on YouTube, “terrifying” – well, it is Halloween …