Calculate the required surface time between dives and determine your new pressure group for safe diving.
Enter details about your first dive
Enter surface interval time and second dive depth
A surface interval is the time spent out of water between two dives. This time is crucial for your body to release excess nitrogen absorbed during your first dive.
During the surface interval, your pressure group gradually reduces as nitrogen leaves your tissues. A longer surface interval means less residual nitrogen for your next dive, which generally allows for a longer bottom time on your second dive.
The minimum recommended surface interval between dives is at least 1 hour, with longer intervals providing better off-gassing and greater safety margins.