There are NONE!!
The “ozone layer” is a self-healing process.
IF there were “holes” then more radiation would pass through the atmosphere, striking the waters covering the earth, and “POOF!”, more ozone is created.
It’s a natural 3 -5 week process and has NEVER been a problem.
Ozone is not created by UV hitting water, it’s generated when UV strikes an oxygen (O2) molecule. The two oxygen atoms split and each recombines with an adjacent oxygen molecule to form O3 (ozone). O3 is inherently unstable generally reacts with something else (oxidation), shedding its extra atom.