If it helps, in that tunnel people are supposed to stand one group to where the hazard tape is on the wall and leave two of the crosses empty. We did only find that out at the end of the tunnel (where the staff were trying to get people to distance and explaining the hazard tape rule) but the staff at the start should have made it clear where the markers were. We did also have to put our masks on before entering the tunnel (I'm sure some removed them once in though). We were distanced anyway but most groups weren't.