Has it been a while since you’ve been scuba diving? Do you feel like your scuba skills and knowledge are a bit rusty? The PADI ReActivate program (a.k.a. Scuba Review or Tune-up) is just the refresher you need. It reacquaints you with diving so that you’re back to feeling comfortable in the underwater world in less than a day. You go over scuba knowledge you learned during your initial training. Then, practice fundamental skills in a pool or a confined water area. To take the ReActivate program, you must have at least a Scuba Diver certification or be enrolled in a scuba certification course.