SUUNTO D6 - Manual (Page 35)

Anyone who engages in any form of breathhold diving is in danger of shallow-water
blackout (SWB), that is, the sudden loss of consciousness caused by oxygen starvation.
Any breathhold diving results in some nitrogen build-up in the blood and other fast
tissues. Due to the short time spent at depth, this build-up is generally not significant.
Therefore, provided the effort involved in freediving has not been severe, there is little
risk in diving after breathhold diving. However, the reverse is more unknown and may
significantly increase the risk of DCI. Therefore, FREEDIVING AFTER SCUBA DIVING
IS NOT RECOMMENDED. You should avoid freediving, and not exceed 5 m/16 ft, for
at least two hours after scuba diving.
WARNING Suunto also recommends that you receive training in freediving
techniques and physiology before conducting breathhold dives.
No dive computer can replace the need for proper dive training.
Insufficient or improper training may cause a diver to commit
errors that may lead to serious injury or death.
5.6. Audible and visual alarms
The dive computer features audible and visual alarms that advise when important
limits are approached or that prompt you to acknowledge preset alarms. The table
below describes the different alarms and their meanings.
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