Further to the investigations in what happened to A35 Scherzo after the Conservatoire International de la Plaisance closed down in the 1990s we have continued to search periodically. I came across this video on Youtube. It is a light-show / series of video sequences shot in the submarine pens whilst the museum was open and features A35 in a rather eerie sequence starting at 8min 20s. It only lasts for a short period – the video immediately below will start playing as A35 comes into view.
You may be interested to play the full video. And if you are into the combination of submarine base light-shows and music Bordeaux are still making them. This one premiered on 1st March 2020: