What should a dry suit diver always carry as a precaution?

A dry suit diver should always carry a backup buoyancy device as a precaution because buoyancy control is crucial for safe diving. If the primary buoyancy control device, typically integrated into the dry suit itself, becomes compromised, having a backup ensures that the diver can maintain neutral buoyancy and avoid potential hazards associated with losing buoyancy, such as uncontrolled ascents or descents.

This backup can be a secondary buoyancy compensator or surface marker buoy, which provides an additional safety measure in emergency situations. Carrying a backup buoyancy device enhances the diver's ability to respond to unexpected circumstances, ensuring a safer diving experience.