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(DIY) buy at HD, apply leak seal from inside OR / m( L( P1 W$ t+ a' G' ~# ?$ \' T0 @' M' F
hire some professional company that armed with high pressure injection equipments to do the leak plug.
, W& r- x7 b% }0 @should work, high pressure injection is the best and have lifetime warranty.% h; V7 a7 ]+ e; F) {1 F8 G& Q1 ~
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hairline cracks not going all the way through wall is not unusual, * r( S3 V! }) h4 X$ j" w
9 e6 c$ r/ K" d( h4 O) x3 `3 Wbig crack is rare, if possible, I rather back off