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Can a deep dived be achieved with reverse pack only?

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New Member
Feb 17, 2023
Hi all,
Is it possible to do a deep dive (40+) using reverse pack only or mouthfill is necessary ?
It is possible and not uncommon, but I find that the divers who go deep with reverse packing are the ones who do it unconsciously.
Anyone who finds equalisation getting "harder" as they go deeper will have a much better time switching over to mouthfill... providing they have proper guidance.
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