Alright then:
The “vikings” are dwarves and as you’ve probably noticed it’s a music video I linked.
The original song has of course its own lyrics.
As kind of a parody I took those lyrics and modified them to fit something else - in this case Onu-Matoran since the song is about caves and digging.
So now if you play the song but sing along with my modified lyrics you get a kinda funny Bionicle song.