Staircase Near To Playground

A Memory of Trentham.

I can remember next to one of the swings shown close to the lake in this picture, was a flight of steps which was fenced off and at the bottom was a door. Does anyone know what this was - was it just a storeroom - or as I was once told - a passage way leading underground to the still remaining entrance of the demolished hall via the bank on the left of the Italian gardens? There was supposed to be a corresponding tunnel under the Rose pergola from the demolished hall to a boathouse on the lake - which can still be seen when you are on the lake!