Been there done that. Had 7 cracks behind paneling in my basement. 4 of which seeped water. My fix was chiseling out crack to a V, drilling hole at bottom into draintile. Cut 1"(or 3/4") pvc pipe in half, put/lay in crack(v) to give water somewhere to go. filled in remaining v with hydrolic cement. reinstall paneling= problem gone. alot of work but it will never leak onto the floor again.
BTW use gloves with hydr cement. if it gets under your finger nails it will lift the nail and hurt like a bitch