We have all been there: your dive buddy is frantically waving their arms, tapping their head, and doing a weird little dance, and you have absolutely no idea what they are trying to say. Underwater charades can be hilarious, but when it comes to air management and safety, clear communication is critical. Don’t wait until you are 60 feet down to realize you and your buddy speak different languages. Here is your complete guide to the universal scuba hand signals every diver needs to know before they giant-stride off the boat.