When planning a deep dive, you should buddy up with a diver who has:

Choosing a buddy with a similar SAC (Surface Air Consumption) rate and equipment is essential for safety and efficiency during a deep dive. A similar SAC rate means that both divers will consume air at comparable rates, which helps in managing air supply more effectively. This is crucial because it allows both divers to stay at their planned depth and duration without one diver significantly outpacing the other's air supply.

Using similar equipment ensures that both divers are familiar with how their gear operates, which can be critical during a dive, especially in deeper conditions where managing buoyancy and handling gear can be more complex. Compatibility of equipment, such as tank capacity and buoyancy control devices, leads to more synchronized buoyancy control and depth management strategies, enhancing the overall dive experience and safety.

Additionally, the combinations of similar SAC rates and equipment tend to facilitate clear communication and a cohesive diving strategy, as both divers will have similar experiences regarding air management and respond similarly to changes in the environment or diving conditions.