u/DeMooniC-

It's been ages since I found something this rare, it took an entire WEEK of searching every day, 8-12 hours or so per day at a searching speed of 10000 systems checked every ~13 seconds or so, meaning I have checked, in total, roughly around ~193,840,000 systems to find this...

Also, shoutout to u/donatelo200 who also searched a lot and could easily have found this too before me! If we take the objects he checked into account, the systems checked count might easily be double

Here are the coords: RS 0-4-1882-334-21654-5-265-205 B5

What allows for the oceans to get this deep is a low liquid composition density combined with a low gravity, the lower two those things are, the deeper the oceans can get before the pressures gets high enough for a for an ice VI sea bottom to form. Meaning, if someone found, for example, a superoceanic with 100% NH3 oceans with the same gravity or lower than this object, the oceans will be deeper, so there's definitely a lot of room for improvement.

That said, this did take ~19 hours of non-stop macro searching to find, so good luck (though I didn't search the best stars for this)

This is not even close to the record deepest ocean ever found in version 0.990, btw which was over 900km deep, as generation changed significantly and those kind of objects seem to no longer be possible, or at least MUCH rarer.

Coords: RS 0-1-1-3-25437-7-381640-132 5.1

Coords: RS 8513-509-5-8169-369 4

This took a few hours of non stop searching what probably was a few million F type stars, found several gas giants that were 0.3, 0.2 or 0.1 earth masses away from the upper mass limit for planets in SE which is this planet's mass, but it paid off!

Also got really lucky with the fact that it just so happened to generate with aerial life which makes it a good amount extra rare