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(DIY) buy at HD, apply leak seal from inside OR 4 H6 U$ y" ]- r$ [$ u8 }3 U5 Z5 X/ [% ^$ }
hire some professional company that armed with high pressure injection equipments to do the leak plug.
* i7 J4 f. a% }should work, high pressure injection is the best and have lifetime warranty.) w0 `0 k) Z5 s/ S d* @
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hairline cracks not going all the way through wall is not unusual, ) B& G" c, a3 M; P) c; D
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big crack is rare, if possible, I rather back off