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I haven’t seen a video of the Zumwalt at high speed but the ones I’ve seen it doesn’t throw much of a bow wave. Good.
On the other hand it looks like it would want to porpoise with lots of blue water over the deck in a sea.

I suspect that the deck is not used during altercations. It may be more of a cover for the operational deck below.

US military ships in the age of sail were low to the water and frequently had water washing over the decks which is why they had catwalks.

Well, it was the first builder's sea trials...so there is not much video.

In addition, each builder sea trial, and later when the Navy conducts its own, will test various things about the ship. They certainly did not exercise her full sea state capabilities on this initial trial. Probably 1/2 or 2/3rds, nothing like flank speed even.

But they did take her out for a few days and exercise her and she performed well for those tests...but they are only the initial tests.

We will definitely see more as she builds up to handover to the Navy, and then as the Navy builds her up to full operational capability. All of that will take 2-3 years.

Here's a decent video of her underway during those sea trials:

Youtube Video of Zumwalt underway during initial Sea Trials/b>