If decompression time is insufficient before surfacing, what should be done at the next depth?

In scenarios where decompression time is insufficient before surfacing, the correct procedure involves shifting to 100% oxygen. This method is vital because breathing 100% oxygen at deeper depths helps in repositioning nitrogen and other inert gases that may have accumulated in the body's tissues during the dive. Transitioning to this regimen enhances the body’s ability to eliminate these gases, thereby reducing the risk of decompression sickness.

Implementing this approach allows divers to assist their systems in off-gassing before ascending further, as it provides an increased partial pressure of oxygen, which can counteract potential symptoms arising from inadequate decompression. It’s a well-recognized technique in diving medicine aimed at managing risks associated with improper ascent protocols.

Using standard procedures or starting a new schedule may not adequately address the immediate risks associated with insufficient decompression, and calling for assistance does not directly remedy the situation at hand. Therefore, shifting to 100% oxygen at the next depth becomes the most effective first response.