One of the lamnate boards in middle of hallway is unsupported underneath

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Laminate floor board springs up and down.
I did not fit it and have no idea who did.
Cannot realistically lift floor from edges to support underneath as out of time.

I think either the board was butted wrong way round without tounge into groove, ie slotted in wrong way, or groove has collapsed becasue nothing underneath it.

This board gets a lot of foot fall so it's going to have to be fixed somehow to avoid further deterioration.

Thinking to drill small hole in middle of collapsing area and foam into it /underneath with low expansion foam, then carefully patch hole with original flooring, of which I have some.

What kind of foam would you use.

Any other ideas?

At end of this 30 sec clip you can see there is a lot of movement in the board.
VIDEO: https://photos.app.goo.gl/7c139QWoeAzi6sw17
 
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Also could carefully prise board up with screw driver and foam into there without cutting small hole.
Would have to guage foam quantity carefully, and place heavy weight on top to limit ant foam expansion.

I will have to check but if this board runs to the door might be able to slide the board back to the door and be able to see how much to level it once slightly exposed.
 
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