Buried Treasure?

Time to start on the next section of the back garden. We have cleared all the shrubs, self set marigolds, weeds and general rubbish growing in this area. The slope on the patio is such that, in heavy rain, we get a pool collecting in the corner of the patio, which takes an age to drain away. we plan to put in a french drain along to edge of this bed, to help reduce this. A simple task like digging a trench soon became a bit more interesting though, when Husbands spade hit something metal............

So we dug a bit more, and a bit more, and a bit more...........

It appeared to be hollow, cylindrical....

In the end, after much procrastinating peering into the object, we decided it was nothing more exciting than an old, upturned cattle feed trough.