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Diving signals every scuba diver needs to know

by Jorge Mezcua on Dec 07, 2022

As mentioned in previous posts, scuba diving is a team sport where underwater communication is very important, vital. Unless you dive with a very expensive voice communication mask, the only way you can talk to your partner will be through diving signals made with your hands, light, bright visual elements that are placed in the cave diving guides or through sounds made, for example, by rattling with the dive knife in the tank.

When you share hundreds of dives with the same buddy you will create your own code of communication, but until that time comes you need to know some basic underwater communication signals that you’ll use to warn of a danger, to show how you feel while diving, to confirm the direction to take or to warn your buddy of the presence of an animal. There are more than 200 common diving signs and there is no hurry not know all of them but you at least need to know some like the back of your hand because that can actually save your life.



scuba diving signal ok

This diving sign is used for both asking and answering, by making the universal OK gesture. It is one of the most common gestures when learning to dive and you will see your instructor doing it very often (if he/she is a good instructor) and after solving any problem (equalizing, dive mask emptying, cramping, etc.)

scuba diving signal ok

The OK diving signal can also be done as in the image above if you’re wearing gloves. Specially Cressi gloves

ok diving signals surface

Another way of saying “I’m OK” is placing both hands above your head in an arc.



This diving signal is used when you are far enough from your buddy so that the hand is not easily visible, for example when we are diving from a boat.

ok diving signals

Another alternative to the above signal is doing OK with placing just one arm above the head.


With fingers extended, palm down will swing one hand when we want to note that we are not well, that we do not feel comfortable and that we need some time and attention of our buddy in case we need help. When your buddy makes this gesture you will stop whatever you are doing and wait until he or she makes "the OK diving signal" before continuing with the dive. I usually have problems equalizing and I make this sign near my ear when I have this problem, pointing to my partner that I cannot keep going down until I equalize.


diving signals equalize

In addition to the above signal to tell your buddy that you cannot equalize, just point at your ear with a finger so he/she knows that has to wait until you get to equalize.


This is one of those diving signs that we hope you never have to do since it represents serious danger and an emergency. It is done by joining the fingers and taking them to the mouth asking for air from your buddy’s octopus as your air tank is empty or something is wrong with it.

give me air diving signal


As in the case of the signal above, this one is also quite sensitive and represents a serious problem in a dive. It is done by placing the palm facing down and simulating a cut to the chest or neck, to say that your tank has no air. If your buddy does this sign you have to give him your spare regulator (or pass him your primary regulator and you use your spare) and prepare for a joint water exit.

out of air diving signal


Almost all diving signals related to a problem or emergency are easily identifiable, and this one, used to communicate with a boat or someone inland, is also clearly visible. Moving an arm on both sides you are asking for help because you have had a problem during the dive and need urgent assistance.


diving signal pick me

This signal does not represent an emergency but we want to locate near the image above to indicate the difference between the two. This image means «pick me up » and is done for someone on a boat to pick you up but does not involve any emergency or danger. The difference between them is the movement. With movement it means danger, motionless means no danger. But yes, if are in one of those situations that you need help your own common sense will be able to show whether there is danger, but it is worth to point it.


cramp diving sigal

This signal is done by opening and closing fingers to indicate your buddy that you have had a muscle cramp (very common in the calf muscles) and either needs his/her help to stretch the muscle and relieve cramping, or you need some time to do it yourself.


Punching in a direction shows the presence of a threat of any kind to communicate to your buddies to be careful or do not go in that direction of the punch.


Another universal diving signal that requires no explanation. Diving is cold very nasty and uncomfortable, but when it becomes too cold it is sometimes better to stop the dive.


By pulling the thumb between the forefinger and middle finger you will show your diving buddy that you have been caught with a fishnet, a rope or similar. At that moment both of you have to be careful and analyze what the problem is and fix it with the dive knife.


diving signals cut

This scuba diving signal also easily recognizable, is done by partner when we cannot get the item we need to be cut, mainly fishing nets.



This signal is one of the most common and often used signals while diving. With the forefinger and middle finger hit in the palm of your hand to ask your buddy how much air is left in the tank.


time up diving signal

Forming a T with both hands shows that we have reached the 100 bar limit, we have half the air in the tank and time is up, it’s time to turn around (the tanks are usually filled to 200 bar). 


With his fist and raised to the height of the head show our partner we only have 50 bars left of air pressure, we have entered the reserve air tank and we need to finish the dive because we have to account for time to do the decompression stops.



descend diving signal

With closed fist and thumb indicating bottom will show your buddy that is time to start deflating the dive jacket to start the dive.


ascend diving signal

Opposite to the sign above, with the thumb pointing toward the surface and moving the hand up to show that the dive is over and we head to the surface.


diving signals stop

Raising your hand forming this universal sign of stop. This diving signal is used whether to point to wait for some other divers to reach us, to show something is worth to be seen, to start ascending, etc…


turn around diving signals

When the dive guide indicates that we are going to turn around he will lift the index finger and rotate it in circles. This sign is usually done when the dive starts and ends in the same place or when one of the divers has 100 bars left. For unmotivated instructors this diving signal also means 15 minutes, half of the dive.


With closed fist and thumb pointing sideways turn forearm 180º to ask and agree with your buddy which direction to take.


This signal is done by putting together the index finger of each hand and pointing to the front. With this diving sign the divemaster will tell you to get closer to your buddy. Sometimes it is because the instructor, for any issue, decides to change the dive buddies and draw two divers to later make this gesture of the image indicating that the two divers have to go together.


together diving signals

By putting both hands in a grip we are telling two divers (usually this diving signal is made by the divemaster) that they have to be secured by their hands. This signal is performed when there is any type of problem like strong currents or bad visibility and is necessary for the safety of divers to maintain full contact.


who leads

To mark who runs the dive the divers are pointed to by using the the index finger in order and then placing the two fingers facing forward, one more advanced than the other. The diver who has been pointed the finger forward is the leader.


diving signals keep depth

With the palm open and down and movements left and right you indicate divers that we’re going to keep diving at current depth.


diving signals slow

This diving signal is also universal and needs no explanation, when you see it you will know immediately what does it mean. This is a signal done usually to Open Water divers that in their eagerness to see more and discover what’s happening underwater, dive very fast.


Another of those universal diving signs that are not only understand by divers. For any questions that your buddy or divemaster makes and you have no answer for have to receive this response gesture, raising your shoulders and with the palms up. Mind you, this act does not apply when you are asked for your air tank level or where your partner is… you always have to know what is the answer to those.


diving signals look

Another clear sign that is commonly used to teach you how to perform certain procedures to those learning to dive or to show something worthwhile during the dive.


When we are diving at night is more difficult to communicate even though the signs are the same except that we use the flashlight on the bottom of the sea or on our own hand. These are the three most common signs that are performed during night dives:


diving signals night dives

To show our partner that everything is OK, that everything is fine, we «draw» a circle in the bottom with the light beam, simulating the OK sign that we do with the fingers during daylight dives .

We can also make this signal with your hand, as we do under good light conditions, but illuminating the hand with the flashlight.

diving signals ok


night diving signals

To draw the attention of your buddies during a night dive move the beam up and down or quickly in circles. This will help them to pay attention to us if we ask something or to show some interesting element during the dive.


Of course there are different signs that will serve to warn your dive buddies about marine life presence during the dive. This kinds of signal are used everywhere in the world and make it clear to which animal it is warning about by their shape like in the case of the sea turtle or mimicking aspects of its common name, as in the case of clownfish, mimicking the nose of a clown. We leave you with two videos of Hannah showing signs that are made for different marine species.

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