First i have to say i only uploaded the movie, i didn't record it nor edited or something else...
The author(Melanie/Spirates) posted in in a forum with the following description:
"Okej, So I found a way to solo HYdross The Unstable in SSC and I haven't seen or heard of anyone who has done this before so I thought I was going to share this with you so I made a short video about it :). "
The fight took 160minutes and 8seconds, but this movie is a) speed up, and b) contains some cuts.
My congratulations to Melanie/Spirates for the great work!.