Floor leveling compound is made for just such a thing.
How to fix low spot under floating floor.
Place the level on different areas of the floor and notice if it lays flat in all spots.
If a gap appears under the center of the level it indicates a low spot if the level rocks back and.
You could do this from the bottom side in your case and drill a larger hole that the straw fits through.
Low spots and depressions in subfloor.
For quick repairs of soft spots in your laminate floor use an air inflation needle or a syringe used to blow up sports balls on a can of spray foam.
It s not the depth of the depression that matters.
Soft spots in a laminate floor can be caused by an uneven sub floor or improper installation of flooring underlayment.
Mobile home windows also have a tendency to leak and may be allowing water to run down onto your floor where it seeps into the flooring and begins to create soft spots.
It may require nothing more than simply sealing small gaps around your window panes with caulk.
Attach an air inflation needle as an extension onto a can of spray foam.
This should be a simple fix.