7-36 Change A
U.S. Navy Diving ManualVolume 2
dive partners mouthpiece. The dive partner guides it to the distressed divers
mouth. Both divers maintain direct hand contact on the mouthpiece.
The mouthpiece may have flooded during the transfer. In this case, clear the
mouthpiece by using the purge button (if single-hose) or by exhaling into the
mouthpiece before a breath can be taken. If using a double-hose regulator, the
mouthpiece should be kept slightly higher than the regulator so that free-
flowing air will help keep the mouthpiece clear.
The distressed diver should take two full breaths (exercising caution in the
event that all of the water has not been purged) and guide the mouthpiece back
to the partner. The partner should then purge the mouthpiece as necessary and
take two breaths.
The divers should repeat the breathing cycle and establish a smooth rhythm.
No attempt should be made to surface until the cycle is stabilized and the
proper signals have been exchanged.
During ascent, the diver without the mouthpiece must exhale to offset
the effect of decreasing pressure on the lungs which could cause an air
Tending with a Surface or Buddy Line. When a diver is being tended by a line
from the surface or a buddy line, several basic considerations apply.
Lines should be kept free of slack.
Line signals must be given in accordance with the procedures given in Table
Any signals via the line must be acknowledged immediately by returning the
The tender should signal the diver with a single pull every 2 or 3 minutes to
determine that the diver is all right. A return signal of one pull indicates that
the diver is all right.
If the diver fails to respond to line-pull signals after several attempts, the
standby diver must investigate immediately.
The diver must be particularly aware of the possibilities for the line becoming
snagged or entangled.