I have a crack (very thin crack, the whole vertical length of my basement wall) in my basement wall that is seeping water when it rains heavily or for a long time. I have requested two estimates. One contractor suggests the use of an hot epoxy injection. The second contractor suggests the use of a nylon string inserted into the crack (the crack would be v-notched) and ran under the floor. The floor would be broken up and the string put under the floor and the floor would be poured with concrete. I am also getting a third contractor quote on Monday. I am not sure what the best method and most cost effective method would be to correct this problem. A guy from work suggests that I dig a hole on the exterior and patch the crack with tar and film. Both options are very expensive (approximately $1500 for each crack)

Can you tell me what would be the best method of correcting the crack?