here is the interior of the large one .. just call me Capt Nemo

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Whale Whisperer:Not on the two boats I was stationed on, we were equalizing pretty often! It sucked when I'd wake up from a headache because of pressure changes
1_T_Submariner:The boats you where on must have been surfacing/ventilating/snorkeling a lot. That's the only time I noticed pressure changes.