Ooh, this one’s tricky.
Here’s the link for others: https://www.youtube.com/watch?v=hx-8ZD8u4ns
I think it may be 3 separate basslines. You can really hear it around 1:01 when the filter opens up a bit.
I’d say they’re all saw waves, with varying filter settings.
The Bass on the left seems simple enough. A decent amount of resonance, repeating two notes.
I hear a real round subby one in the middle just bending up and down in pitch. Probably a simple Triangle LFO modulating pitch at 1/2 rate.
And then another bass in the middle, brighter, with a pitch envelope making the pitch drop at the end of the note.
That’s where I’d start. But I think this one will require some experimentation.