material it has a first end 71 which has a point 72 on it intended for being inserted first down the hole it has a second end 73 with threads 74 by which it may be attached to a sending cable the tool 75 has at least one and preferably a plurality of snagging devices 76 spaced axially apart and radially apart from one another around the central axis 77 in this embodiment a snag member 80 is pivotally mounted to the body in a slot by a pivot pin 81 the body is formed with a recess 82 that has a lead in ramp 83 and a snag recess 84 formed by a sloping surface 85 facing toward the second end of the tool and sloping outwardly and upwardly toward it the snag recess has a floor 86 in which there is formed a detent groove 87 a bias spring 88 is seated in a bore 89 and is held in compressive opposition between the body and the snag member so as to bias it counterclockwise in fig8 a detent member 95 is pivotally mounted by pivot pin 96 near to the free end of the snag member the free end of the detent member can be seated in detent groove 87 to hold the snag member in its ready position shown in fig8 the free end of the snag member is pointed toward the second uphole end of the tool in operation a wire 97 for which the tool is used to fish may encounter detent member 95 and drive it toward the first end so as to release the snag member so that the bias spring can force it toward the position as shown in fig9.