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How deep were you, for how long, and most importantly: How was your ascent?
With this tool, you can examine your dive and decompression in detail. You’ll get your dive profile, a bar chart showing the saturation of the 16 model compartments and an evaluation, and you can print it as a PDF. <\/p>\n<\/div>\n
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At the moment, we can only read data in Subsurface format ssrf or xml. So you need to have Subsurface installed on your computer and upload your dives from your dive computer there.
To save a profile, go to File – Export, and simply select the default Subsurface format. Then save your profile somewhere you can find it again, and you’re ready to upload it here to the tool and analyze it. <\/p>\n
If you already use Subsurface to evaluate your dive profiles, our tool probably won’t offer you much new information. But if you’d like a simple overview of your dives and their risk, you’ll find some guidance on the evaluation here. <\/p>\n
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The tool is almost self-explanatory. You upload a dive, and a complete analysis is displayed immediately.
At the top, you’ll see the profile of your dive with some key data. The core of the evaluation tool appears directly below: a bar chart showing tissue saturation. After uploading, it’s initially positioned at the end of the dive when you reach the surface. From there, you can move the slider back and track tissue saturation throughout the entire dive.
Each bar represents a compartment, with the half-time shown below. The “fill level” is the inert gas pressure in the tissue, ptissue, in bar.
We don’t start the dive at zero\u2014all compartments are in pressure equilibrium with the environment. The inert gas pressure in the tissue is then just under 0.75 bar\u2014slightly less than the 0.79 bar in breathing air. This is because the inhaled air in the lungs is saturated with water vapor, and oxygen is consumed while CO\u2082 is released. So more gases are involved than just those in the breathing gas. This means less partial pressure is available for nitrogen than in dry air.
When ambient pressure increases, the inert gas pressure in the tissues also increases, at very different rates according to their half-times. We see saturation in bar, plus two lines: the M-value each compartment would have at the surface, in red; and the current ambient pressure in blue.
While a compartment is saturating, it’s initially displayed in blue. When the inert gas pressure in the compartment becomes so high that the M-value would be exceeded if you were instantly “beamed” to the surface, it turns red. This indicates that it’s no longer a no-decompression dive. This compartment must desaturate enough during ascent so that the M-value isn’t exceeded at the end of the dive.
Two additional colors indicate desaturation. When the inert gas pressure in the compartment is higher than in the breathing gas, gentle desaturation occurs and the compartment is green. When it’s higher than ambient pressure, the compartment is supersaturated and turns orange. Of course, compartments must be supersaturated to desaturate efficiently\u2014so toward the end of the dive, more and more compartments turn orange.
To see exactly which values are relevant in each compartment at any given moment, you can hover your mouse over the bars and a small info window will open. There you can see not only the inert gas pressure in the compartment and in the breathing gas, as well as ambient pressure as exact numbers, but also the M-value of the compartment at that depth, at the surface, the current GF and the surface GF at that moment. This allows you to track the state of each individual compartment at any point in time.
Below this, relevant key data from the dive are displayed, along with some notes on what these values indicate. A more detailed explanation follows further down the page\u2014but first, let’s get into the tool. <\/p>\n
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