How was this bass sound made?

https://youtu.be/Ju1Sthng0Vs?si=-QrZCziGReDcqrM2

Im talking about the longer bass, not the plucky one.

Starts at around 1:02 in the track.

It sounds like 1 main sinewave + at least 1 more sinewave at a different frequency to introduce some wobble, while both of the oscillators are slowly dropping in pitch, anyone have any ideas?