Double Tunnel Greenhouse

The Double Tunnel Greenhouse is a style of Tunnel Greenhouse, using two Tunnel Frames ?, that is an Inner Frame ? and Outer Frame ?, which support the Inner Cover and the Outer Cover ? - between which is created the bubble Cavity Space.

The image above shows the Outer Frame ? (with the Outer Cover ? removed) and the Inner Cover is shown covering the Inner Frame ?. The lower section of Cavity Space forms a Soap Liquid Reservoir ? that is flooded with the dilute soap and water Soap Solution.