well... that didnt take long. we were putting in our confer curved steps and my son was helping me with the tube sand weights we built. he dropped one. it is 20 lbs. It made a nice concave dent in the bottom of the pool floor about 1 inch deep. I donned some goggles and dove down and looked at it. Liner looks fine, it formed into the dent, no wrinkles or nothing. Pushing on it a bit with my fingers I worked a little bit of it out.
its not a big deal to me, as its right next to the side of the stairs where no one will hardly ever be anyway.
what effect do dents like this have on the liner? does it cause any lifespan issues or can it rupture or is it just a "cosmetic" issue.