Screen Rant

The Romulans have seized a Borg Cube in Star Trek: Picard. 1 / 7

And are busy stripping it down for science and profit. 2 / 7

Prior to the start of the series, the Borg attacked a Romulan scout ship. 3 / 7

And those aboard were assimilated...but then suffered a submatrix collapse. 4 / 7

The affected Borg were severed from the Collective. 5 / 7

Thus, the Romulans could sweep in and make the cube their own. 6 / 7

Was it the Zhat Vash who made themselves immune to Borg assimilation? 7 / 7