What would be the recommended minimum surface interval time if a diver has just completed a dive to 25 meters (82 feet) for 50 minutes?

In this scenario, the recommended minimum surface interval time is based on the dive profile and the table or computer being used for the dive. When a diver has spent 50 minutes at a depth of 25 meters (82 feet), their body has absorbed a significant amount of nitrogen due to the pressure and duration of the dive.

To safely plan for subsequent dives and avoid the risk of decompression sickness, it is crucial to provide adequate time for the body to off-gas the absorbed nitrogen. A minimum surface interval is calculated based on depth and time, and in this case, a 60-minute surface interval is typically the standard recommendation for a dive of that duration and depth.

This allows for adequate decompression and ensures the diver's safety for any potential follow-up dives. Given that a 60-minute interval adheres to guidelines and best practices established in diving tables and dive computers, it is seen as a prudent choice for returning to the surface safely after a dive.