What happens if the surface interval of a Sur 'D' exceeds :07?

When the surface interval of a Sur 'D' exceeds seven minutes, this situation implies that the diver must be carefully monitored to prevent the risk of decompression sickness due to inadequate decompression profiles. Continuing compression to a depth of 60' is a valid response in this case as it allows for the ongoing management of the diver's decompression schedule while ensuring safety.

Maintaining the appropriate depth during the surface interval means that the diver is still within a controlled environment, which can help in managing inert gas washout and minimizes the potential for complications that could arise after a prolonged surface period. By continuing compression, the diver's condition can be effectively monitored, and necessary adjustments to their decompression plan can be made based on physiological responses and dive tables or computers.

This strategy prioritizes the diver's safety and adherence to established procedures for managing decompression, which is crucial in air diving operations.