...well, yesterday, actually - my usual car deck on the ferry (7) totally empty for some reason - apart from a single Leaf using one the charging points there and a few dogs in the kennels who seemed keen on any visitor.
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The 'ceiling' to the right of centre is actually Deck 8 and can be dropped down onto the fluorescent brackets that can be seen along the stanchions and by the 'Lift' sign, to almost double the capacity for cars. It tends to be used more during the summer months, allowing trucks to use anywhere on Deck 7 the rest of the year.
I noticed the doors were open on my way up from Deck 5 this time and had a quick look round - we could have passed the crossing time with a bit of footy, but I suspect the fire suppression is a bit hostile, if you're stuck down there after the doors are locked.