for context which is often lacking in posts like this, this is what a Super Heavy is (I had to look it up lol because it's not really obvious from the title alone):
There WAS more context, but some moderator of hacker news merged in the post with more context into this link that was posted first. That erased all the context.
Also the significance is not Super Heavy landing in the Gulf of Mexico, but Starship landing in the Indian Ocean.
https://en.wikipedia.org/wiki/SpaceX_Super_Heavy
meta but it absolutely would not kill anyone to include some context in your submissions here.