the pocket of air i'm quite familiar with! (not personally, disaster videos like you) the swell ripping the bottom of the boat off, damn! never seen that, but i've water skiied and it was like concrete when i went down, so i'll believe it...
i remember seeing videos of some single hulled boats racing, and you get the shots of them from the right angle, showing the contact patch, and it's more or less the motor is in the water, and the entire hull is about 1/2" off the water cruising across the lake, a small skip every 30 feet or so... would be pretty rad to see something like that on open water, none the less an open boat that is more or less home built!