|
غواصان نمیتوانند در زیر آب صحبت کنند مگر دارای ماسک تمام صورت مجهز به رادیو باشند.اما غواصان می توانند ارتباط خود را با استفاده از علامت های دست برقرار سازند.
=== جدول علامتهای دست ===
{| class = "wikitable"
|-
!شماره
!علامت
!معنا
!ملاحظه
|-
|۱.
|Hand raised, fingers pointed up, palm to receiver.
|STOP
|Transmitted in the same way as a [[traffic police]] officer’s STOP
|-
|۲.
|Thumb extended downward from clenched fist.
|GO DOWN or GOING DOWN
|
|-
|۳.
|Thumb extended upward from clenched fist.
|GO UP or GOING UP
|
|-
|۴.
|Thumb and forefinger making a circle with three remaining fingers extended (if possible).
|OK! or OK?
|Divers wearing mittens may not be able to extend 3 remaining fingers distinctly.
|-
|۵.
|Two arms extended overhead with finger tips touching above head to make a large O shape.
|OK! or OK?
|A diver with only one free arm may make this signal by extending that arm overhead with finger tips touching top of head to make the O shape. Signal is for long-range use.
|-
|۶.
|Hand flat, fingers together, palm down, thumb sticking out, then hand rocking back and forth on axis of forearm.
|SOMETHING IS WRONG
|This is the opposite of OK! The signal does not indicate emergency.
|-
|۷.
|Hand waving over head (may also thrash hand on water).
|DISTRESS
|Indicates immediate aid required.
|-
|۸.
|Fist pounding on chest.
|LOW ON AIR
|Indicates signaler's air supply is reduced.
|-
|۹.
|Hand slashing or chopping throat.
|OUT OF AIR
|Indicates that the signaler cannot breathe.
|-
|۱۰.
|Clenched fist on arm extended in direction of danger.
|DANGER
|
|-
|}
== خطرها ==
| 