Fort Boyard - Mission Impossible

The contestant climbs a ladder and enters the cell (a museum) via its window. Inside are a number of obstacles, such as ladders and nets, which the contestant must climb over to get to the key. If the floor is touched an alarm goes off; the contestant automatically loses and is taken away to the cages. The key is in a locked cylinder which is opened using a tool (either a suction cup or a magnet, since 2010) given to the contestant at the beginning. The contestant must leave out the window, still not touching the floor. Some players have dropped the key or the tool or even knocked pieces of the scenery loose, resulting in a lock-in.

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This one about 5 or 6 people lock in that