Same as if a well trained diver in a dry-suit decided to ride out a hurricane. If he had a re-breather system and enough O2 and other gases to sustain the system - maybe drop a line bristling with tanks a little ways down? Leave enough slack between the buoy the tanks and you and maybe you can swap when needed? He could adjust his buoyancy to stay just below the crazy weather and read a water-proofed Kindle. Well, that and he might want to coat whatever exposed flesh he has to the water with petroleum or silicone goop. He might need a bag of fresh water, too - and god help him if he has to take a dump or whizz during the time he's in the water - but aside from those little complications? Meh.
Granted I assume a lot here since there was once I was going diving off the coast of Cancun - and OHMYFUCKINGGOD were the waves ridiculous. I was about to puke all over the deck till my dive buddy said "Don't stay on the boat - get in the water and go to about 8 feet. The desire to retch will subside. If you stay on the boat you'll only want to die." He was right. As soon as I was at about 8 feet it was serenity. I looked above to see the ladder to the boat leaving the water and plunging and saying to myself "wow, that's gonna be a fun ride coming back out of the water." The 76 minutes below were awesome - the 15 trying to get back into the boat? - The nausea came back with a vengeance and I blew chunks...
But it got me to thinking - anything able to get below the tossing waves should be perfectly fine to ride out a storm. It's being prepared to stay submerged that long and all the complications that entails - up to and including taking on enough nitrogen that even at 15 feet you may have to decompress a while (I don't remember if that would happen or not since 15 feet is the safety stop for rec diving? That and you could use mixed gasses at that depth that can be at times pure O2. But yeah, why not a dry suit with the right plumbing, a water-bag and protection for exposed flesh to the salt water? Hell, I'd do it on a dare just to see if I could do it - calm weather first, of course :-) Might be dark and lonely knowing you have a freaking typhoon right above your head in the blackest midnight. But what the hell, if the book is good I could float there forever.