Stow Away

I was in a large warehouse with a lot of boats stored inside.  I looked behind me and there was a box that was shaped like a door, tall and not very thick.  There was a piece of plywood that was coming out on the bottom of the box.  It moved out more and more .  I pulled the piece of plywood off and there was somebody inside the box.  It was somebody I knew but had not seen for a long time.  They told me they were living inside the box and somebody had nailed it shut while they were in it.  I asked him how he could breath inside the box and he said that he just barely made it out.