Multilevel diving
All simulation variables are calculated in real-time as the dive progresses, including tissue nitrogen levels. A further complication to normal dive considerations is multi-level diving where a diver moves to one or more different depths during the dive. There are two considerations here:
Dive computers handle both of these differently according to make and model. In common with most dive computers, Diver-Sim recalculates the no-stop time (NST) according to predicated nitrogen levels and the maximum time the diver can remain before levels exceed set limits. Note that the NST changes according to which tissue is currently the limiting factor (a small white bar is placed on the x-axis of the limiting tissue on the saturation graph).
Most modern computers take into account the theory of gas nuclei, or 'microbubbles' when calculating no-stop time. These are supposed to be formed during ascent, so a dive profile that bounces up and down is obviously the most provocative to DCS. When Diver-Sim thinks such bubbles are forming, it will enhance the uptake of nitrogen, slow off-gassing, and reduce the NST accordingly.