With your right arm still extended far from your body, release the regulator and let it fall. It is possible that you will not be able to see the regulator, but follow the steps of the regulator recovery skill and you will find it easily. Remember the first time you attempt regulator recovery, your instructor will be there ready to give you his
alternate air source if you have any problems. You should also have your own alternate air source attached somewhere that you can reach it easily, and the first time you do this skill you should be in shallow water. In the worst case scenario you can just stand up.