Norm, I had this same issue in my vinyl lined IG pool. It's an easy fix
Get a scrap piece of liner. Cut it in a circle that is larger around than the cut is wide. Get some barge glue, or a glue from a pool store that is made for this. Slather the glue on the backside of the patch, a good amount. Fold the patch over on itself, glue side in. Take a deep breath, dive down, unfold the patch and quickly place it over the cut. Smooth it down tight from the inside working your way out. When it's done put a heavy weight on it (I used a brick on a can) to keep it in place while it sets up.
Works like a charm
Good Luck.
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