What does the term "ditch and don" refer to in diving?

The term "ditch and don" specifically refers to the procedure a diver follows during an emergency situation where they must quickly remove their diving gear (ditch) and then put on or switch to backup equipment or an emergency flotation device (don). This procedure is crucial in life-threatening scenarios, such as when a diver needs to ascend rapidly due to insufficient air supply or an equipment failure. Knowing how to effectively ditch and don gear ensures that divers can respond swiftly and safely in emergencies, making it an essential part of dive training.

In this context, the other options do not accurately capture the definition of "ditch and don," as they refer to different aspects of diving practice and safety.