Yeah, dealt with that once or twice, during a trip from Roosevelt Roads (Naval Station, Puerto Rico) back to Mayport (Florida), back in 1981. On board the USS Elmer Montgomery (FF-1082), an old Knox class frigate. We were hitting 10 to 15 foot seas, and doing a bit of wall walking ourselves. Every time we'd nose into a swell, you'd feel the ship tipping back-back-back (as it's climbing the wave), then it would reach it's fulcrum point, and tip over into the valley between waves, where the screw would pop out of the water for a second. It's that free-wheeling of the screw, until it bites water again, that causes the shuddering, as it goes from X turns per minute, to XX turns, and back to X again, all within a couple seconds. Shakes the whole damn ship!
Linflas, pretty sure you meant the safety nets, and not the catwalks, right? Those older (non-nuke) carriers were a good 10,000 tons lighter than the present day carriers (if not more), and really get tossed around a bit in the higher seas. I served on the Enterprise (CVN-65, the Big E), and I remember them telling us, during a NorthPac exercise, that we had taken 2/3 of the launches and recoveries on board our flight deck, during the exercise, just due to the fact that our flight deck was much more steady than the older carriers (and the pilots enjoyed that, for some reason!!

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I only mention the safety nets versus catwalks, due to the fact that the catwalks were a bit sturdier, and welded to the ship, versus the safety nets that are mechanically attached (nuts & bolts), and thus easier to tear off.
And yes, I understand about the fun you guys had on deck. One of our guys almost rode a tow tractor over the side, when the combination of an icy flight deck during a turn (never heard whether they heard the "heel to port" call over the loudspeakers or not), while towing a plane, almost caused the whole kit & kaboodle to tip over the edge! They said the guy in the tractor and the plane captain in the jet both were standing on their brakes, and the front end of the tractor was about to go over the edge when it all stopped ......and it's said that no plane was ever chocked & chained more quickly in the history of the ship, as that one was when it came to a stop!!