The title seems to use meters as the article says "anything up to 25 meters". It's a bit jarring how it switches between systems and then gives conversions on some imperial units but not others.
It's also odd to read about Europe in measurements like "cubic miles" given there's only one country in Europe using imperial and their system is different from the US imperial. The author is a self-described "Yorkshireman" so I assume it's UK imperial but I have no idea what that means for American audiences. Are US and UK miles the same?