What factor is crucial when selecting a buddy for deep dives?

While tank size and pressure are important considerations for deep dives, the most crucial factor when selecting a buddy is their experience level and ability to handle deep dive situations effectively. A buddy must be capable of managing the challenges associated with deeper depths, including potential problems like narcosis and the need for more elaborate dive planning.

Selecting a buddy based primarily on tank size and pressure does not necessarily ensure that they possess the necessary skills for safe deep diving. Ensuring that both divers are experienced and share a similar level of training and comfort in deep dive environments is vital for both safety and enjoyment during the dive. This is especially important in emergencies, where having a competent and confident buddy can make a significant difference.

Therefore, while tank size and pressure are relevant to dive logistics, the focus should be primarily on the mutual experience and training level of the divers to ensure safety during deep dives.