To optimize no-decompression bottom times while planning repetitive dives, each successive dive should be to what depth?

To optimize no-decompression bottom times while planning repetitive dives, each successive dive should be to a shallower depth. The reasoning behind this is grounded in how nitrogen absorption works during dives.

When divers descend, they absorb nitrogen from the compressed air they breathe; the deeper the dive, the more nitrogen is absorbed. Upon ascending, divers release some of the nitrogen, but during repetitive dives, if the depth is increased or remains the same, there may be a cumulative effect of nitrogen loading, increasing the risk of decompression sickness.

By planning each successive dive to be shallower, you reduce the amount of nitrogen that is further absorbed, allowing for safer and more extended bottom times without the need for decompression stops. It effectively minimizes nitrogen buildup in the body, which is critical for staying within no-decompression limits.