It appears that the structural polymer (plastic) wall of your pool is cracked. This is a SERIOUS issue. The real repair involves excavation, and replacing that section of the wall.
You *may* be able to patch it by epoxying over the crack, and replacing the liner. Whether this is possible depends on at least 2 factions:
1. Will epoxy adhere to the wall? (If the wall is polyethylene based, the answer is "No!".)
2. Is the cracked caused by past movement, or by on-going movement. If the latter, then any patch will fail.
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