Depth, bottom time, and events are the key details that describe what happened on a dive. The Dive Log is the record that captures these specifics for each dive: the maximum depth reached, the total bottom time, and any events that occurred during the dive—such as equipment issues, gas checks or changes, deviations from the plan, or safety stops. Keeping a Dive Log gives you a personal history to review later, helps with planning future dives, and makes it easier to spot trends or address problems with procedures or gear. Other records serve different purposes: a Dive Record Card is typically used for certification or course tracking, an Equipment Maintenance Log tracks servicing of gear, and an Incident Report documents accidents or incidents. So, for documenting depth, bottom time, and events, the Dive Log is the appropriate record.