ROcket was far away fromplanet when lunched, This are probably gigant islands far far away from crater

Or it could be the placed in Subnautica 3!

*gasp*

It could be a jungle.

In Below Zero, it says Planet 4546B is a pretty small planet, so that's why I'm posing this thought.

Hmm... maybe.

IF it was not size of earth and like 30 km everything would jump higher... a lot of higher than on earth. IDK

Ye and you can see sector zero on the during the cutscene too