If there is a 1 block height hole and a water source next to it, you can walk through it.
I attached a video (no Audio) where you can see it how it works
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well i mean you dont want to suffocate in the stone blocks do you?
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No, you dont suffocate because the hitbox is smaller then 1 block.
In an older Snapshot (18w07a i think) you were able to sneak and you have seen other caves, but you still didn´t suffocate
Edit: You were able to see other caves because the eyes got moved up, but the hitbox was still small