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One for all or all for one?
The self-sufficiency mindset is where the diver is fully self-sufficient and approaches the dive with the view that they can perform the dive on their own and would be fully able to complete the dive without a buddy. The approach is summed up by the mindset that if you can’t do the dive on your own then you should not be doing the dive at all.
The other approach is team diving where strong team work and cooperation are the focus of the dive, and you plan to dive with a team of divers, and the team works as a well coordinated whole.
These two approaches seem to have a very different emphasis, and many divers think that they are contradictory. That is, you have to decide whether you have a self-sufficient approach or a team-based approach and that it is a choice of one or the other. Both approaches have their extremists who will go to great lengths to explain why their approach is right and the other approach is wrong.
In some areas, technical diving in the United Kingdom has evolved into a culture of solo diving where many experienced technical divers dive solo. All equipment choices are made on the basis that you will be diving alone or that your buddy will be of no use. Gas planning is based on the principle that it is impossible or unlikely that your buddy will be any use in an emergency and so all procedures are based on individual action.
The team diving approach also has its extremists who focus on teamwork as the primary goal and consider self-sufficiency to be a sign of weak teamwork. These divers will only dive with divers who follow the exact same team procedures.
In reality, these two extreme positions are not very realistic, and when taken to extreme, counteract the very point of the principles. This can cause significant problems, as the advocates of self-sufficiency can refuse to see some of the benefits of team diving, whereas the advocates of team diving refuse to see any benefit in self-sufficiency...