Dragon's den?

......or possibly it's just a pied-a-terre (or maybe that should be pied-a-mer?) of one of the local urban/seaside foxes.....but whoever made it (and is obviously still using it!) , this little tunnel leads in under a pile of loosely stacked sawn-off branches now overgrown with brambles at the bottom end of the garden-over-the-road (the brambles being the reason I was down there in the first place, just checking on whether there were any worth picking yet....sadly there weren't )