We should retrieve that when it comes to diving it may be considered as a group action. One of the crucial element of a well performing group is the effective communication between it’s course, some sort of portable radio devices may explain the problem, but electronic systems are not very popular. In recreational diving is still popular to communicate by a hand gestures. The most common hand signals are command marks.
These marks require a back talk. We have three command marks:

a.Ok – the use of the ok signal does not change from its known higher water application. Like every other command marks, the ok sign must be returned, either with an
affirmation or an indication of the difficulty if the one occurs.
b.Stop/hold – failure to properly recognize and acknowledge the hold signal can be very hazardous. Misunderstandings relating to the hold
signal have resulted in few confusing places and a least one death. 'Stop' is communicated with an open palm.
c.Exit – when communicating that a dive is down, divers must be especially clear. Dives may be terminated for any reason: because a team member has reached thirds, or because he is uncomfortable, cold, or feeling not healthy. The moment the exit command is given, all divers is required to get feedback in kind, and begin to exit the overhead. To reduce confusion, most divers use the ascend signal.

We may say, that effective communication, is something which cement a group of a divers. When it comes to effective mutual effort hand marks, light signals, and electronic channels are very necessary|essential. Talking about popular hand marks used by peple who dive to communicate we may take under our analysis the following signs:

1.out-of-air – That gesture is performed, by drawing the hand across the throat. Of course, the out of air command asking immediate attention. Upon receiving this emergency signal, divers should prepare
to donate air while quickly approaching the out-of-air diver.
2.Silt – Disturbance of the fundamental sediment , may be indicated by rubbing the thumb traversing the ends of one’s fingers while holding the hand in a palm-down posture. A divers may opt to use this command to communicate to other divers that they are disturbing the fundamental condition, or to give a notice the team of a particularly exposed area.
3.Light is on – divers should frequently look at other divers to verify that t is all ok with their equipment, and to determinate whether are any irregularities, such as bubbles activated by accident.
4.Safety stop – it is suggest that on every dives, regardless of decompression responsibility, divers execute at least a three minute safety stop. One usually used command to indicate a safety stop is to hold a fist with a raised pinky finger.
5.Line – the middle finger crossed over the index finger is a usually to indicate the line. A diver may communicate more specific information about the line with signal used in conjunction with this signal.
6.Bubbles – in order to indicate the presence of bubble, the diver holds out one hand and rings the index finger on to the thumb in a repetitive motion with the amount of distance increasing to indicate larger bubbles.

During loss of seeing under water, light and hand marks while underwater, become useless. Divers must resort to physical contact to communicate with one another. If entangled in the line, divers can communicate a this by crossing the middle and index fingers, an placing them in a dive buddy hand, twisting them back and forth. In touch contact, both divers should be on the line and in contact.Therefore, to
communicate a line entanglement, a diver can simply follow the line up to the dive buddy’s hand, and using the space former by the diver’s hold on the line, insert his own signaling fingers therein. In back talk, divers can acknowledge this entanglement by firmly squeezing the entangled diver’s hand on the line.

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