I don't think I posted on my collapsing tunnel. Don't panic ......
I just wanted a micro with storage... and a pit mine, a lid that covered it; plus some quick change scenery for either country or industry. Laying it flat is a grassland lid, or flipped for a construction site "mud-lot"& connecting pavement. I don't really use the storage. No telling what I left in it Cranes and industry have dominated this hand bent micro 0-20" since this time; hence the tunnel is collapsed now