You should not perform a dive as long
as the no-dive warning is displayed on
the computer screen. If the warning is
prompted by microbubble accumulation
(as opposed to CNS O
2
over 40%) and
you dive anyway, you will have shorter no-
stop times or longer decompression times.
Moreover, the duration of the microbubble
warning at the end of the dive can increase
considerably.
4.7.3 SOS
If you stay above a depth of 0.8m/3ft for
more than 3 minutes without observing a
prescribed decompression stop, MANTIS
will switch into SOS mode. Once in SOS
mode MANTIS will lock up and will be
inoperable as a dive computer for 24 hours.
If it is used for diving within the 24hours
of an SOS lock, it will automatically
switch to gauge mode and provide no
decompression information.
WARNING
Violating a mandatory decompression obligation
may result in serious injury or fatal issue.
Serious injury or fatal issue may result if a diver
does not seek immediate treatment should any
signs or symptoms of decompression sickness
occur after a dive.
Do not dive to treat symptoms of decompression
sickness.
Do not dive when the computer is in SOS mode.
The display shows the same information as
when in the presence of desaturation, but
on the bottom row SOS is displayed.
4.7.3.1 Desaturation reset
MANTIS allows you to reset the
desaturation of the computer. If tissue
saturation information from a recent dive
is reset to zero, the computer will treat
the next dive as a non-repetitive dive. This
is useful when the computer is loaned to
another diver who has not dived in the last
48 hours.
Chapter Desaturation reset describes
how to make the desaturation reset.
F
NOTE: After a desaturation reset the
change between the modes GAUGE,
APNEA and SCUBA is possible
immediately. However, since the
GAUGE and APNEA modes are not
tracking your tissue nitrogen loading,
it is recommended to keep the initial
intervals between changes on modes.
WARNING
Diving after having reset the desaturation is
extremely dangerous and is very likely to cause
serious injury or a fatal issue. Do not reset the
desaturation unless you have a valid reason to
do so.
F
NOTE: Removing and replacing the
battery will not reset the desaturation.
MANTIS stores tissue saturation
information in a non-volatile memory.
For the time that the computer is
without a battery, the desaturation
calculation is frozen, and resumes
from where it left off as soon as a new
battery is installed.
4.7.4 Diving with nitrox
Nitrox is the term used to describe
breathing gases made of oxygen-nitrogen
mixes with the oxygen percentage higher
than 21% (air). Because Nitrox contains
less nitrogen than air, there is less nitrogen
loading on the diver’s body at the same
depth as compared to breathing air.
However, the increase in oxygen
concentration in Nitrox implies an increase
in oxygen partial pressure in the breathing
mix at the same depth. At higher than
atmospheric partial pressures, oxygen
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