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I wonder if they will build more stable landing platforms. If you look at oil drilling rigs, they stay calm even in relatively heavy waters.

But oil rigs aren't easily movable, and they will want to get the rocket back to land. I suppose they could crane it across onto a drone ship barge, but landing directly on the barge in the first place seems to be working out ok so far and saves a huge amount of extra cost, time and trouble.

I believe oil rigs are heavily anchored. I believe the barge either has no anchors, or less (or less massive ones.)

It's not about having anchors, it's about not being affected by the top layer of water which moves up and down due to waves. If you submerge (your center of gravity) just a few meters under the surface, you'll suddenly be much more stable and much less affected by the waves. Oil rigs, just like ice bergs, have a large part that is submerged and invisible on the surface. Look at this for example: https://s-media-cache-ak0.pinimg.com/736x/73/64/d6/7364d6da3...

The problem with a rig is all that vertical structure. It limits where the vessel can be towed to for offloading. To get this rocket off, they need a regular commercial dock.

I'm pretty sure they already flood the ballast tanks for stability.

An even better example of this: https://en.wikipedia.org/wiki/RP_FLIP

That's presumably part of the reason that Blue is planning on using a much heavier ship.

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