What exposure adjustment is necessary for a successive oxygen dive if the Off-Oxygen Interval is less than 2 hours?

In the context of successive oxygen dives, the Off-Oxygen Interval (OOI) plays a critical role in managing exposure limits. When the OOI is less than 2 hours, the body does not have sufficient time to adequately eliminate the residual inert gas that may be present from the previous dive. This incomplete clearing can lead to an increased risk of decompression sickness or other complications due to accumulated nitrogen or other inert gases in the tissue.

To mitigate these risks for subsequent dives, it's important to adjust the exposure limits based on the time spent in the previous dive. This involves decreasing the exposure limit for the next dive. By reducing the exposure limit, safety is prioritized by acknowledging that the body is still in the process of off-gassing and is therefore more susceptible to potential diving-related medical issues.

In contrast, options suggesting no adjustment or increasing the limits do not account for the increased risk associated with a short OOI. Switching to open-circuit breathing does not directly address the need for careful management of the off-gassing process related to prior dives.

Understanding this principle helps divers maintain safety during successive dives and fosters a more respectful approach to nitrogen management in diving practices.