Oxygen decimal fraction
Here, you can see the measurements of the oxygen decimal fraction before diving, after a 12-minute dive, and after a 30-minute dive.
The oxygen level with no seal under the dome is 0.2094.
Table 1 - Resting oxygen decimal fraction
Table 2 - Oxygen decimal fraction during a 12-minute dive
Table 3 - Oxygen decimal fraction during a 30-minute dive