Hi Alex, Welcome to DB.
You have asked questions that have answers that could fill many pages. Way too complicated for a simple answer. Learn to use the search function and read the thread on how to begin freediving in the beginners section.
For a short answer: 1. Lots of controversy, 2.Yes, lots, 3. It is possible to get bent, but not for beginners. Read about BO.
Connor
Connor
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