Crankbait can be deadly when it comes to Largemouth Bass or Trout fishing. Crankbait comes in a variety of different configurations to accomodate different fishing scenarions. Top water crankbait is good for fishing on top of the water. Medium and deep diving crankbait feature a diving lip that makes the crankbait swim downword. It can dive anywhere from 3 to 20 feet deep. Lipless crankbait does not dive but it can submerege to couple of feet deep depending on how fast you retrieve the lure.